C. The mighty waves threw themselves angrily against the shore's jaw. is your best answer.
The question is asking "Which sentence... makes something seem human..." this suggests the use of personification. This means that you'll have to find a sentence that gives human traits to a non-human.
In this case, waves is the "non-human", with the human trait of "throwing themselves angrily". Waves don't "throw themselves" or be "angry", rather, it is human traits being used to describe how the waves were.
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