Answer:
C. Metaphor
Step-by-step explanation:
A metaphor is a figure of speech in which a word or phrase is applied to an object or action to which it is not literally applicable.
A simile is a figure of speech involving the comparison of one thing with another thing of a different kind, used to make a description more emphatic or vivid.
An instruction is a direction or order.
A question is a sentence worded or expressed so as to elicit information.
Therefore the answer is metaphor, because "If we could blossom out of ourselves, giving nothing imperfect, withholding nothing!" is a figure of speech in which a word or phrase is applied to an object.