To solve this question, the user needs to know the basics of grammar, syntax, and sentence structure. The user must identify the part of the sentence that has an error and choose the corresponding option.
In this case, the sentence is:
"The verbal statement of the witness (a) differed greatly (b) from his written statement.(c) / No error(d)"
The sentence is grammatically correct, and there are no punctuation errors. Therefore, the correct option is: