The sentence that correctly uses a hyphen in a compound modifier is D, Enrique's dream is to become a full-time singer.
The other words do not need hypens. You can hyphenate two adjectives, like well-behaved, but only before the noun. So, you can say my well-behaved little sister, but not my little sister was well-behaved (it should just be well behaved).
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I believe the answer is B ^^
