The eyewitness testimony was incontrovertible.

The correct answer is A. unquestionable.

The word "incontrovertible" means "not able to be questioned or contradicted." In other words, it is something that is certain or indisputable. In the context of the question, the eyewitness testimony was incontrovertible because there was no evidence to contradict it. The eyewitness was reliable and had no reason to lie. The testimony was also consistent with other evidence that was presented in the case.

The other options are incorrect because they do not accurately describe the eyewitness testimony. Option B, "disputable," means "able to be questioned or contradicted." Option C, "unacceptable," means "not acceptable or satisfactory." Option D, "debatable," means "open to discussion or argument."

In conclusion, the correct answer to the question "The eyewitness testimony was incontrovertible" is A. unquestionable.