Your eyes are as green as the grass in the summer time.
This is an example of...
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The green eyes are being compared to the green grass, so the only two answer choices that could deal with a comparison are simile and hyperbole. Since there is no exaggeration going on and the comparison uses as, then we can figure out that the answer is A. Simile.
A big thanks to Alison for this question! Alison, green eyes are also symbolic of jealousy and I'm sure all of your classmates are full of envy over how smart you are.