I believe the answer is a
Hope that helped :)(
In order to show my commitment towards my health is by keeping a balance between exercise and food sources.
The root word which means "red" is a. erythr/o.
Just think about biology - you should know that red blood cells are called erythrocytes, where you can obviously see that root word.
Leuk/o refers to white color, and the other two options do not refer to colors at all.
