Aforum presents a united front with a more formal speech presentation from each group member.

The statement above is FALSE. 
The statement above describes a SYMPOSIUM. A symposium refers to a public discussion, in which members of a group share the responsibility of presenting information about a particular topic to an audience. Each member of the group has to deliver his or her own speech. 
A forum on the other hand refers to a situation in which an audience direct their questions to a  group and group members have to answer the questions with impromptu speeches.

Not b or c so that leaves you with a or d. a is the better choice.