Jamarcus was his collegiate chapter's delegate at a national conference of a professional business fraternity, Phi Chi Theta, in which he is a member. When the business meeting was conducted, parliamentary procedure was used, and Jamarcus was not familiar with this. Thus, he looked to the others to learn how he should behave in this situation. What type of influence does this reference group exhibit?

Informational

Explanation:

Based on the information provided within the question it can be said that the type of influence that the reference group is exhibiting is Informational Influence. This term refers to when a group discussion provides new information or discussions which allow the members of that group to develop new beliefs, attitudes or behavior towards the subject(s) in question. Which in this scenario the information provided by the other group members helped Jamarcus develop his behavior/attitude for these meetings.

i think it is the third one.