Liliana is writing a research paper about the positive effects of exercising. Liliana's thesis is: People that exercise a minimum of three times a week for thirty minutes per workout are healthier than people that do not. She has decided to survey 50 people and use the results to support her thesis. 17 Which keywords would help Liliana find the most information for her paper on the Internet? A. doctor recommendations B. thirty minute workouts C. benefits of exercise D. health problems