Read the scenario about a formal discussion.

When he presents his point of view in a group discussion, Will is knowledgeable, acknowledges other viewpoints, and answers questions fully. However, he uses many slang terms and idioms when he speaks.

Which skill should Will improve to become more effective at participating in a formal discussion?

A. being prepared to speak on the topic
B. supporting a point of view with facts
C using language appropriate for the topic
D. explaining his point of view to others