I believe your answer would have to be A. " he"
C. The powerful nature of love can enrich or destroy.
Answer:
Because what you already have isn't ever satisfying enough. It's called adapting, as soon as you get something, you will always crave more. I guess you could call it a psychological addiction.
or
Looking forward to something or pushing for something gives people something to do, and helps you look forward to something later in life.
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I doubt this is correct but I hope it helps a little! :)
