Correct option is B
The correct meaning of the highlighted word incessant is "to continue without
any interruption."
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Incessant: Something that happens continuously and without stopping. (अविरल, लगातार)
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Example: The incessant barking of the dog kept her awake all night.
Meanings of the other options:
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(a) To occur at irregular intervals or occasionally – Something that happens now and then, not continuously. (अनियमित अंतराल पर घटित होना)
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(c) To impact in a strikingly negative way – To affect something in a harmful or intense way. (प्रभाव डालना, विशेष रूप से नकारात्मक)
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(d) To follow an unknown course – To move without a definite direction or plan. (अज्ञात दिशा में बढ़ना)