Answer: The answer is C, they spend more time together exercising.
Explanation: Eating more fast food may increase your weight, talking to each other will not be very effective in terms of weight loss, and neither spending more time as a family, however, if they talk to each other or spend time as a family while exercising, this will be effective to lose weight. While you are not guaranteed to lose weight while exercising the first day, or even week, moving your body will help you lose weight eventually. Plus talking and spending time together may help fix family issues or help prevent them.