Answer:
b. informational social influence
Step-by-step explanation:
Informational social influence is a psychological or social phenomenon that describes the tendency of an individual to accept the information of others we consider accurate and correct most especially when faced with ambiguity or obscurity. We simply conform to the opinions of others we believe have an accurate information we seem not to have. In such situation, we simply conform to what they are doing because we believe they are right.
When participants in an experiment conform to others' answers as explained in the scenario given in the question, we can infer that it best illustrates the impact of informational social influence rather than influence from peers.