My mom __________-(cook) food when I reached home.a.cooksb.is cookingc.All the aboved.was cooking

To choose the correct answer for the sentence "My mom __________-(cook) food when I reached home," we need to analyze the options given.

1. Break Down the Problem

   • The sentence is in the past tense ("when I reached home"), which implies that an action was happening at that time.

2. Relevant Concepts

   • The verb tense is important here. The correct form of the verb "cook" needs to match past continuous tense because the action (cooking) was ongoing when another past action occurred.

3. Analysis and Detail

   • Option a: "cooks" is present tense and does not fit the context.
   • Option b: "is cooking" is present continuous tense and is also not suitable for past context.
   • Option c: "All the above" is not valid since not all options are correct.
   • Option d: "was cooking" is past continuous tense, which indicates that the action was ongoing in the past, fitting perfectly into the context.

4. Verify and Summarize

   • The only correct and logically consistent option is "was cooking."

Final Answer

The correct answer is d. was cooking.