Hyperbole
If don't know what it means its best to start of with what you do know
Process if elimination.
It's not a simile because it has no like or as.
Its not Personification cause its not giving the object human features.
And its not metaphor cause its not literally Applicable. I'm assuming.
So that just leaves you with hyperbole.
Answer:
opponent , combatant similar meaning
The correct answer to the given question above is the content of "What Exactly Are Green House Gases". The author in the story "An Inconvenient Truth" uses the content of "What Exactly Are Green House Gases" to emphasize how humans can improve the atmosphere.
D, I just took apex right now