### Analyzing the Options

1. **Definition of Primary Sources**: Primary sources are original materials from the time period being studied. These can include firsthand accounts, original documents, or any other source of information that has not been altered or interpreted.

2. **Reviewing Each Option**:
- **a. Textbooks**: Textbooks are secondary sources because they summarize, interpret, or analyze primary sources. They are compilations of information rather than original documents.
- **b. Letters**: Letters are primary sources because they are original written communications from individuals.
- **c. Diaries**: Diaries are also primary sources as they are personal records of events, experiences, and thoughts from the individual who wrote them.
- **d. Photographs**: Photographs can be considered primary sources if they capture an event as it happened, providing visual evidence from the time of study.

### Conclusion

Upon evaluating all options:
- Textbooks are the only item that does not qualify as a primary source.

### Final Answer
**a. Textbooks**

Question

### Analyzing the Options

1. **Definition of Primary Sources**: Primary sources are original materials from the time period being studied. These can include firsthand accounts, original documents, or any other source of information that has not been altered or interpreted.

2. **Reviewing Each Option**:
   - **a. Textbooks**: Textbooks are secondary sources because they summarize, interpret, or analyze primary sources. They are compilations of information rather than original documents.
   - **b. Letters**: Letters are primary sources because they are original written communications from individuals.
   - **c. Diaries**: Diaries are also primary sources as they are personal records of events, experiences, and thoughts from the individual who wrote them.
   - **d. Photographs**: Photographs can be considered primary sources if they capture an event as it happened, providing visual evidence from the time of study.

### Conclusion

Upon evaluating all options:
- Textbooks are the only item that does not qualify as a primary source.

### Final Answer
**a. Textbooks**

Knowee AI · Accepted Answer

### Analyzing the Options

1. **Definition of Primary Sources**: Primary sources are original materials from the time period being studied. These can include firsthand accounts, original documents, or any other source of information that has not been altered or interpreted.

2. **Reviewing Each Option**:
   - **a. Textbooks**: Textbooks are secondary sources because they summarize, interpret, or analyze primary sources. They are compilations of information rather than original documents.
   - **b. Letters**: Letters are primary sources because they are original written communications from individuals.
   - **c. Diaries**: Diaries are also primary sources as they are personal records of events, experiences, and thoughts from the individual who wrote them.
   - **d. Photographs**: Photographs can be considered primary sources if they capture an event as it happened, providing visual evidence from the time of study.

### Conclusion

Upon evaluating all options:
- Textbooks are the only item that does not qualify as a primary source.

### Final Answer
**a. Textbooks**

Which of the following is not a primary source of information?Select one:a.Textbooksb.Lettersc.Diariesd.Photographs

Question

Which of the following is not a primary source of information?

Solution

Analyzing the Options

Conclusion

Final Answer

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