Judge the Following Sentence According to the Criteria Given Below

Judge the following sentence according to the criteria given below. Wave refraction focuses erosion at headlands and favors deposition in adjacent bays along the shore because the velocity of water decreases as it moves upslope against the force of gravity.

A) The assertion is correct but the reason is incorrect.
B) The assertion is incorrect but the reason is correct.
C) The assertion and the reason are both correct, and the reason is valid.
D) The assertion and the reason are both correct, but the reason is invalid.
E) Both the assertion and the reason are incorrect.