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

### Question:
Scientists have categorized trees based on whether they keep or lose their leaves each year. Another logical way to categorize trees is based on the

### Choices:
A. types of nutrients needed to grow.
B. amount of oxygen that is released into the air.
C. color of leaves that are produced.
D. type of fruit that is produced.

### Answer:
