Moon
Hi,
I too had this exact same question and did not have a clue what the answer should be as I do not ever recall studying it from the AFE Met. book.
However, I think I put C also but I can not remember if this was the correct answer or not from my paper.
I thought my exam went shockingly however I managed to pass with 75%. Not a great mark but a pass is a pass!
Good luck with your next re-sit!.
Regards