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To know English mean to be able to communicate with billions of people around the world.
This answer choice corrects the original Subject Verb Agreement mistake, by changing the plural verb mean to the singular verb means to match the singular subject To know.
This answer choice is grammatically incorrect: the singular subject to know English does not agree with the plural verb mean.
This answer choice repeats the original mistake: the singular subject to know English does not agree with the plural verb mean.