Question

Identify the​ adverbs: An unprecedented use of central bank actions is now showing itself to be increasingly ineffective.

Answer 1

There is only one adverb in this sentence, and that is the word increasingly.
Adverbs are used to modify verbs or adjectives - and in this sentence, the word increasingly is used to modify the adjective ineffective.
There are no other adverbs in the sentence, so the word increasingly is the only correct answer.

Answer 2

The two that i see are "now" and "increasingly". hope this helps