What is emphasized as crucial when writing business letters?AUsing complex vocabularyBIncluding personal storiesCClear and concise communication

In writing business letters, the most crucial aspect is C: Clear and concise communication. Clarity helps ensure that the message is understood easily by the reader, who may not have the same background or context. Conciseness ensures that the letter is efficient and to the point, respecting the reader's time and making the communication more effective.

Using complex vocabulary (A) can lead to misunderstandings and may alienate readers who are not familiar with the terminology. Including personal stories (B) may be inappropriate in many business contexts, as they can detract from the purpose of the letter, which is typically to convey information or make requests. Thus, prioritizing clarity and conciseness is essential for successful business correspondence.