THE PHRASE “THIS VAST AMOUNT” IN LINE 4 OF PARAGRAPH 1 REFERS TO ____...

46: The phrase “this vast amount” in line 4 of paragraph 1 refers to __________ .

A. 80,000 million cubic miles of water B. 24,000 cubic miles of rain

C. 80,000 cubic miles of water D. 300 million cubic miles of water