Correct option is C
The correct option to fill in the blank is (c) monotonous.
Explanation: "Monotonous" means dull and repetitive, which describes the unchanging rhythm of the musical piece. (Hindi: नीरस)
Example: The monotonous tone of his speech made everyone lose interest.
Explanation for incorrect options:
· Irreverent: Refers to showing a lack of respect, not related to rhythm.
· Recusant: Means someone who refuses to comply, irrelevant here.
· Coherent: Means logical and consistent, opposite of what is implied in the sentence.