You could find in sewage treatment plants

a halophiles
b thermophiles
c melosphiles
d all

D. all

Explanation:

We are used to seeing animals in environments such as rivers, forests or even in the backyard of our home. However, there are species of animals that live in extreme environmental conditions. This incredible adaptation has come as much from evolution as from the ability to use many things from these environments to their advantage. We call these incredible animals extremophiles, that is, organisms capable of living in extreme environments. Some of these organisms may be called halophiles, thermophiles and melosphiles that are capable of surviving in saline and high temperature environments.

Because of their incredible survivability, these organisms can be found in many different environments such as sewage treatment plants, which are operating units of the sewage system that by physical, chemical or biological processes remove pollutant loads from sewage, returning the final effluent treated product to the environment in accordance with the standards required by environmental legislation.