C is the only bad sounding thing out of this bunch.
I believe the correct answer to this question is B.
This is the correct answer because the other options can be eliminated and this choice represents the proper process described in the question. Answer choice A describes photosynthesis, which is not being asked about in the question. Answer choices C and D are either partially false or describe an unmatching process with the question.
I hope this is correct and helps you!
River mouths would be the answer
