Explanation:

Let’s break it down:

- Tapering off means something is gradually becoming less, or slowing down. Picture rain easing up after a storm.

- Option 1: *Tenable* means something that can be defended or held, like an argument or position. Not related to tapering off.

- Option 2: *Inundate* means to flood or overwhelm, like when you get way too many emails. This is the opposite of decreasing.

- Option 3: *Repudiate* is to reject or disown—like refusing responsibility. Again, not about decreasing.

- Option 4: *Abate* means to lessen or reduce in degree. If the noise abates, it dies down—it tapers off.

Correct Answer:

Option 4 - abate