Debate is a good classroom activity. It provides opportunity to students to think critically and also respect the thoughts of others. Learning how to debate has many benefits for primary school children. It helps them develop their speaking skills and ability to express themselves verbally in front of a group, which builds confidence. It is the ability to see one statement or idea from various perspectives, through critical thinking, critical listening and critical speaking. So, the answer (c) is correct as this debate sensitises students on the need to ban diesel vehicles completely in transportation because diesel is harmful for environment.