Boundaries: Punctuation and Sentence Structure

SAT Reading and Writing· difficulty 2/5

Geothermal energy is a renewable resource ______ it harnesses heat from deep within the Earth to generate electricity.

Which choice completes the text so that it conforms to the conventions of Standard English?

Explanation

A colon introduces an explanation of "renewable resource." "," is a splice; " " is a run-on; ", that" creates a fragment.

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