"Richard's friends include the following people; Ryan, Beckett, and Espo." Which punctuation mark should have been used instead of the semicolon in the sentence?

In a well-developed essay, explain the elements of interpersonal attraction. Include a

discussion of factors that affect attraction. What will be an ideal response?

Speeches about objects must be ________

A) comprehensively formed B) clearly focused C) constructed familiarly D) constantly flowing