plant leaves closing up when touched butterflies migrating south for the winter green insects sitting on green leaves earthworms moving through soil
I gave my students this multiple choice question: Which description is an example of camouflage?

Only one answer is correct among these 4 choices:
- plant leaves closing up when touched
- butterflies migrating south for the winter
- green insects sitting on green leaves
- earthworms moving through soil

Could you tell me which one is correct?

green insects sitting on green leaves