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: In erosion, the higher the elevation, the farther the stream is from where it will reach base level and the more cutting it has to do.
 Question: If Milo is observing a stream at a low elevation and he follows the stream up to a lower elevation, what happens to the amount of cutting the stream has to do when eroding the stream bed beneath it? 
 Choices: A)increases 
B)decreases
decreases