Choose the answer that best matches the word in italics. Billy was afraid to reach into the cavernous storm drain for his lost ball the hole test.

To determine the answer that best matches the word in italics, we need to understand the meaning of the word "cavernous" in the given context. "Cavernous" typically refers to something that is deep, large, and resembling a cavern or a cave. In this sentence, the storm drain is described as cavernous, indicating that it is deep or open like a cave.

Now, let's look at the answer choices to see which one matches the word "cavernous":

A) Darkened
B) Enormous
C) Mysterious
D) Slippery

Based on the description of the storm drain as cavernous, the answer that best matches the word in italics is B) Enormous.