'Irreversible' is an adjective and it should be qualified by an adverb. 'Nearly' is an adverb which means almost. 'Close', on the other hand, when used as an adverb, means near in position, time, or condition. On these grounds, the phrase given in the sentence and option (D) can be negated. Moreover, option (D) uses simple past tense, whereas the sentence is framed in present continuous tense. Option (A) 'Rare' is an adjective and does not fit into the context of the sentence. So, it is rejected. Option (B) is incorrect because the sentence is in present continuous tense and the option is in past continuous tense. Option (C) is the best suited option because nearly, which is used as an adverb, means 'almost' and brings out the correct meaning of the sentence. Hence, (C) is the correct answer.
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