|Question 2Verbal

Source Texts

Text
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?
compounding
A
obscuring
B
interrupting
C
expediting
D