The answer you are looking for is under option A
It is called a Building: Because the suffix 'ing' is added to verbs to make noun forms. For instance a celebrity's following. Following describes the people who follow them in a noun form.Building is a noun form of a thing that exists as the result of the act of those who built it.
Answer:
By conducting to plant more trees and reducing the use of gas that emitting Co2 that cause to rise the temperature.
