Spiny Norman said:

fsm said:

I was told that if you didn’t know the answer in a multi-choice exam like that, to pick C or the longest answer as C is often the most common correct choice (but is it?) and incorrect answers don’t need further explanation.
So based on that I’ll pick D.

Having given this further thought, the answer is obviously 0%, but if they changed b) to 0% I don’t know what the answer would be.