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

### Question:
A car may produce many forms of energy from the fuel it uses. Which indicates that a car does not use fuel with 100% efficiency?

### Choices:
A. The car changes speed.
B. The car engine gets hot.
C. The car stops quickly.
D. The car slides on slippery streets.

### Answer:
