How Does a Bridge Promote Erosion in a Channel

How does a bridge promote erosion in a channel?

A) The bridge pilings interfere with the water flow, causing additional sediments to be deposited.
B) The water velocity decreases, due to restricted flow over the floodplain.
C) The water velocity increases, due to restricted flow over the floodplain.
D) The channel height decreases, and large particles fall out, creating more surfaces for erosion to occur.
E) A bridge does not promote erosion.

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