Simile- he's like a lion
metaphor - I'm going to blow my top
I believe the word means being cautious in this context.
Green literature is one type of literature that has the objective of describing environmental problems and it also deals with the topic of nature. The stories that belong to this kind of literature may also be concerned with how to solve these environmental problems and ecological sustainability.
Green literature is known as <em>environmental literary criticism,</em>too.
I would say it is answer A as the tone of the poem is very joyful