Answer: C.) Exercising instead of being inactive
Explanation: All the other options are unhealthy and show poor self-discipline. Google defines self-discipline as the ability to control one's feelings and overcome one's weaknesses; the ability to pursue what one thinks is right despite temptations to abandon it. Option C shows a person with high self-discipline, instead of being inactive, they chose to exercise.
Probably the last one. It's the least realistic way to make your body healthy. If you are going to do exercise and make yourself healthy, friends would be helpful in that process and exercising is definitely a good way to be healthy.
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Cleanliness, comfort, climate