B
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
Roger poured water over a pile of sand. Some of the sand washed away. This process is similar to which of the following?

### Choices:
A. The eruption of a volcano
B. The erosion of the walls of a canyon
C. The uplifting of mountain ranges
D. The forming of dunes or mounds in a desert

### Answer:
