Aren’t you going a little over board on reporting someone who’s answer is wrong? You literally don’t even know the answer yourself. Just say the answer is wrong and not report them.
The answer would be A. if he lost 8 seconds off of 3 pit stops that means he lost 24 seconds. if he can’t 10 seconds for the 2 he made, he gained 20. so therefore, he is only 4 seconds behind the leader. I hope this helps :)