How would genetically altering crops for pest resistance be economically beneficial

Genetically altered crops for pest resistance are beneficial to the economy by: reducing the cost of buying pesticides by farmers, aside from being pest resistant, it can also be resistant to wind and rain damages as its genes are already altered, lesser soil and water pollution as pesticides can sometimes contaminate the soil and water through leaching.

It is called the medulla oblongata or people usually call it medulla. it is the lower half of the brain stem continuous with the spinal cord. 

The answer is b) gene