Which words most clearly suggest a challenging time? bounced, fitting, earn cowed, rollicking, game delighted, diverting, exhausted, demanding, overcome?

exhausted, demanding, overcome

Explanation:

These are the words that best describe a challenging time. Someone who is exhausted is most likely struggling with something in his life that he finds difficult. Moreover, a situation that is demanding is probably also a challenging one. Finally, overcome describes getting over a difficulty, which is also a characteristic of a challenging time.