What is one limitation of using letters home from a general as a source about world war ll? a. his observations are recorded too close to the events occurred b. the author of the letters may not have experienced the events firsthand c. the letters are unbiased records of events he personal observed d. people may not tell the whole truth when writing to a family member

Your choice is between B and D.
Without a terrific amount of research, I don't think you can distinguish between the two of them. It is well known that Eisenhower for example, wrote personal things to his wife. He did not say much about the war. If he did, his letters would have been heavily censored. I'm pretty sure it would be D. B is true of many high ranking officers who still had much of importance to say.

D <<<<answer