Question

grasshoppers make noises with their legs and wings. there are little bumps on their back legs. grasshoppers rub their wings on their bumpy legs. that makes noise. the noise is like a soft drum. how do grasshoppers make noise? they rub their wings on their legs. they hit their legs on the ground. they beat their wings on the grass.

Explanation:

The text clearly states "Grasshoppers rub their wings on their bumpy legs. That makes noise." So we just need to check which option matches this description.

Answer:

They rub their wings on their legs.