Question

use \those old piano blues\ to answer the following question.
read this dictionary entry.
boom \\b\um\

1. a deep hollow sound 2. a rapid increase in activity 3. a long pole for holding a microphone 4. a barrier to obstruct navigation

which definition most closely matches the meaning of boom as it is used in paragraph 4 of the excerpt from the article \those old piano blues\?
a definition 1
b definition 2
c definition 3

Explanation:

In paragraph 4, the context is about playing the piano. When playing a piano, the sound produced is relevant. Definition 1 is about a deep hollow sound which fits the context of piano - playing sound. Definition 2 (rapid increase in activity) is more about business or economic contexts. Definition 3 (long pole for holding a microphone) is related to audio - visual equipment setup. Definition 4 (barrier to obstruct navigation) is about maritime or traffic control.

Answer:

A. Definition 1