Here's a problem to solve: A caterpillar eats an oak leaf. Which of the following best describes the energy transfer in this situation?

Among the 4 following options, which is the correct answer?

- A: Both the caterpillar and the leaf gain energy.
 
- B: Energy is transferred from the leaf to the caterpillar.
 
- C: Decomposers in the leaf obtain energy from the caterpillar.
 
- D: The oak tree gains energy when the caterpillar eats the leaf.
 