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

### Question:
A squid is an animal that lives in the ocean. It pumps a stream of water out of its body, causing it to move rapidly. Which of the following mechanical systems moves in a way most similar to the squid?

### Choices:
A. a bus
B. a helicopter
C. a rocket
D. a train

### Answer:
