Answer:
I'm doing this to get virtuous
I believe the answer is the third option "Because outside research adds scholarship to my own opinion." Hope this helps. (ノ◕ヮ◕)ノ*:・゚✧
. A Poison Tree is a short and deceptively simple poem about repressing anger and the consequences of doing so. The speaker tells of how they fail to communicate their wrath to their foe and how this continues to grow until it develops into poisonous hatred.