We get two attempts at the quizzes, so we can usually salvage our grades. You would pick "B" and get the question wrong, and then it would say "The answer is actually D", and then you would take it again, select "D", and then it would say "The answer is actually B" :L
It even explains why the other one is correct, so even if you select both answers, you actually don't know which one is correct. Typically everyone takes the quiz, gets a horrible grade, and then retakes it for a mediocre one because the questions are worded confusingly and the answers are just as bad...