Answer:
3. are unsure what is effective
Step-by-step explanation:
Informational social influence is a phenomenon in social psychology, which describes the tendency of an individual to act or behave as others who they perceive are "right" act or behave. The individual, when faced with situations that they have limited knowledge about, looks up to others' behaviours and decisions and thereby confirm to the knowledge of others they perceive might be knowledgeable.
Someone who is unsure of what is effective is usually very susceptible to informational social influence, and would most likely just agree with what others agree on.