Which statement is true about dialogue

The correct answers to the original question would be A. Because dialogue takes up a lot of space, it should be avoided in short stories, and C. Dialogue using the character's own words is one way to tell readers what a character is like. As we're probably talking about short stories, long tirades of dialogue should be avoided for practical reasons; also, the dialogue is a very efficient way to convey what a character is like to the reader.