Microorganisms are involved in

A. causing disease.

B. curing/treating disease.

C. preparing food.

D. cleaning up pollutants.

E. All of the choices are correct.

Answer: All are correct

Explanation:

Microorganism are involved in many of the processes. These processes may be harmful or beneficial for the human beings.

The microorganism are involved in many of the food processing companies and used to make products that are useful for the human beings.

These organisms are also used in cleaning of the pollutants from the nature. These are bacteria which causes disease in human beings.

So, the correct answer is option E