Final answer:
Normative social influence is the most likely type of social influence that would operate when deciding how an organization's money should be invested in the stock market.
Step-by-step explanation:
In the scenario of deciding how an organization's money should be invested in the stock market, the type of social influence that is most likely to operate is normative social influence. Normative social influence occurs when people conform to the group norm to fit in and be accepted by the group. In this situation, the committee members may feel pressured to invest the organization's money in a certain way to align with the group's expectations and avoid social repercussions.