The answer is (c) note the main ideas. If you already note the main idea it will help you better.
Answer;
-It determines the range of attitudes that a text can effectively express.
The voice impacts the tone in that it determines the range of attitudes that a text can effectively express.
Voice is the quality that makes an author's unique and conveys the author's attitude, character and personality. In other words it is a characteristic speech and patterns of a narrator.