Answer:
suggestibility
Step-by-step explanation:
Based on the scenario being described within the question it can be said that this is an example of the term known as suggestibility. This term refers to the quality of an individual describing their inclination to accept and act on the suggestions or opinions of those around them. Such as in this case since the police officers mentioned that the girl had a blue shirt , is gave Alex the inclination to believe the girl was actually wearing a blue shirt when testifying.