Ihad put a as the answer but it was wrong

a lack of corroboration indicates that
a. no other sources present the same information or point of view.
b. the author isn't considered to be an expert in his field.
c. the subject is complex and difficult to understand.
d. supporting documents are difficult to find.

Active reading to kill a mockingbird, twelve through twenty-one during the trial, atticus questions four witnesses. as you read, complete the chart below by noting the key information given by each witness during questioning. also note how each witness behaves on the stand, commenting on the general impression the witness makes. answer for the following characters: the sheriff, bob ewell, miss ewell, and tom robinson.