B. I pressed myself against the trunk of a thick tree, a wolf in sheep's clothing waiting to strike.
Explanation:
This is the answer that best uses figurative language to match the paragraph's tone. In these lines, the author uses figurative language by describing the think trunk of the tree, and how he was "a wolf in sheep's clothing." Moreover, this matches the tone of the paragraph as it describes the author as a vicious attacker with little remorse.
