Question water-

3.2 Form, Structure, and Sense - Modifier placement and clarity
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Water in the North Atlantic Ocean is pushed eastward by powerful winds, but the rotation of Earth and interference from nearby landmasses together cause blank to swirl into a massive, churning whirlpool—also called the North Atlantic Gyre—that spins clockwise.

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

A.

these

B.

those

C.

them

D.

it