GMAT Sentence Correction (SC) | In January this year, a chemical used in the processing of coal leaked

In January this year, a chemical used in the processing of coal leaked from a ruptured storage tank into the Elk River,an accident that interrupted water supply for days because of water pollution, and this called for immediate action from the authorities.

A> an accident that interrupted water supply for days because of water pollution, and this called

B> an accident that interrupted water supply for days because of water pollution, calling

C> interrupted water supply for days because
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