Select the sentence with an error:options: 1) Exercise is necessary to our health, however, inappropriate exercise can

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Select the sentence with an error:options: 1) Exercise is necessary to our health, however, inappropriate exercise can prove harmful. 2) The selection process is a complicated one but has proven effective. 3) Because the company's management system is so complex, quick decisions are seldom reached. 4) The mayor decided not to run for re-election; she was interested in running for a higher office