How is it strongly supported? There is a pretty big assumption that 'most other people' do observe proper language usage.

What if most other people use the language right even less than the author does? That assumption alone makes this hard to support.

Probably one of the stupidest mistakes I have made.... I said C because I was stuck on the polluting bit instead of speed, and cars still pollute at a low level when at at stoplight facepalm

This might seem like silly advice, but one of the most powerful things you can do is believe in yourself! Believe in your body of work, and believe that you will do better than you ever have before when it is time to take the exam and the stakes are raised.

Write sticky notes on your mirrors saying how great you are under pressure, and even if you don't believe it at first, keep reading it over and over. If you do believe that you are, you will be.

@AnikaVenkatesh I made the exact mistake you made, I picked A, but I didn't really like it. I eliminated D because nothing in the passage suggests it is a new practice.