Answer and explanation

Correct answer: C. The collection of rare New Zealand flora has been donated to the botanical institute.

  1. Step 1: The subject of the sentence is the singular collective noun 'collection', not the plural prepositional object 'flora'. Step 2. Therefore, the singular auxiliary verb 'has' is required. Answer: The collection of rare New Zealand flora has been donated to the botanical institute. Why not the others: 'Have', 'were', and 'are' erroneously agree with the intervening plural noun phrase.

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