Which of the following advertisements effectively appeals to logic? a. "lose weight, feel great! sign up now for a free one-month trial of our new exercise program." b. "feeling down? lacking energy? our new exercise program will you kick-start your life. sign up now! " c. "recent studies have shown that people who exercise live longer than people who do not. come try our new exercise program. free one-month trial." d. "exercise is good for you! sign up now for a free month of our new exercise program."