<span>created by oneself or itself </span>
The authors purpose to persuade not to do steroids
I would choose the last choice, D. Adverbial.
Adverbial phrases include two or more words that serve as adverbs. So "in an hour or two" can be classified as an adverb phrase.
Assuming that you refer to the mending wall, the one that the speaker bame for the gaps in the wall is :
Hunter and nature.
'the work of the hunters is another thing, i came after them and made repairs'