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A - replace the adjective MUCH with MANY as the former is used to modify uncountable nouns and the latter is used to modify countable nouns. Although there is no specified noun in the sentence being modified, the sentence is talking about people who are concerned, so the noun PEOPLE is implicit. Since PEOPLE is countable, MANY will be used. B, D - no error. C - replace the adverb THERE with the possessive pronoun THEIR as it is being used to refer to the personal information of people.
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