The answer is "A" Frost endured a number of hardships during his lifetime.
Explanation:
It's cause it is the most logical answer. Knowing Robert Frost & his background he often wrote sad poems with dark midnight moods and happy poems which uplifted you most often set in a place daytime. Robert Frost also faced many hardships during his lifetime (from an autobio I read about him). So we can connect this from his speech and Robert Frost's background to conclude and find this answer.
