The correct answer is C. Hitting the water with an awkward belly-flop, Roland splashed everyone sitting by the pool.
Step-by-step explanation:
In grammar, misplaced or dangling modifiers are common mistakes that occur when a modifier (word or set of words describing or modifying others) is not placed beside the word it modifies (misplaced) or appears alone and therefore does not modify the adequate element (dangling).
In the case presented, the modifier is "Hitting the water with an awkward belly-flop" and the word it modified is "Roland" because it was Roland the one that jumped to the water and splashed everyone. According to this, the modifier should be followed by the word it modifies to be correctly placed and therefore the sentence with no misplaced or dangling modifiers is"Hitting the water with an awkward belly-flop, Roland splashed everyone sitting by the pool."