In this excerpt from <em>It</em> by Stephen King, the part in the elypsis (...) talks about how the character is experiencing these feelings as while he was doing cocaine. While he was at it, he started to find a similarity between the high he was feeling and the thrill of childhood, but not quite.
Therefore, your best answer is nostalgic.
A compares the speakers reflection to a predatory Burr that haunts the speaker
The answer is D. past participle
