All big cities are facing the problem of environmental pollution as a result of a large number of vehicles on the roads. The best way an individual in the city can contribute towards environmental protection is by

Correct option is A

The correct answer is using a public transport system for travelling.
If an individual in the city wants to contribute towards environmental protection, then he should avoid personal vehicle and prefer to use public transport system. Public transportation can reduce the need for many separate trips by private vehicles in dense urban areas, replacing many separate emissions-producing vehicles with fewer transit vehicles that generally emit less pollution on a per person basis. Also, public transport causes much less additional road congestion and air pollution than a car.