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Verbal·Craft and Structure·Words in Context

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For most of its length, the Pungue River has sufficiently high flow velocity to suspend sedimentary particles; but when the river reaches the calmer waters of the Indian Ocean, its channel widens and divides, reducing flow velocity and thereby __________ sedimentary particle suspension. Particles are thus deposited, eventually forming deltaic lobes.

Which choice completes the text with the most logical and precise word or phrase?

A

compounding

B

obscuring

C

interrupting

D

expediting