What is the major type of stress that occurs at convergent plate boundaries?

compressional stress is the answer you want and need

These are the three most common types of stresses that occur at different types of plate boundaries. 

Compression- convergent boundaries
Tension- divergent boundaries
Shear- transform boundaries 

Therefore, Compression, or compressing stress, is the major type of stress that occurs at convergent plate boundaries.

C

Explanation:

By not having any competion in the food process, they are able to have more food.