Question

Ocean acidification, caused by the absorption of excess carbon dioxide by the oceans, possess a significant threat to marine ecosystems.

Given below are sentences with an error in each. The error is in one part of the sentence. Below each sentence are given the options containing the parts of the sentences. Choose the option which contains the error. If no error, choose option e ‘No error’.
A Ocean acidification, caused by the absorption
B of excess carbon dioxide by the oceans,
C possess a significant threat
D to marine ecosystems
E No error
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