Given the task definition and input, reply with output. You are given a short paragraph, a question and two choices to answer from. Choose the correct answer based on the paragraph and write the answer(not the key).

Paragraph: The size of the eroded particles depends on the velocity of the water. Eventually, the water deposits the materials. As water slows, larger particles are deposited. As the water slows even more, smaller particles are deposited.
 Question: If Mona is rafting on a river and the river is moving quickly, what happens to the size of particles that river deposits if the water slows down? 
 Choices: A)increases 
B)decreases
increases