Short Contango = Long Backwardation?

Hi everyone,

Just a quick question from the 2015 mock exam… the question about which postion would have the highest roll yield

Of course, it is the long position in a backwardation market since the futures price increases to the spot price, but the the other position that was a short contango messed me up and I choose that answer because the futures price changed by a bigger amount indicating higher roll return (since the spot return was the same for all positions.

Would appreiciate some clairification on short positions in backwardation / or short in contango markets… and I guess it is not the case that short contango is not equal to long backwardation…

Thanks a lot everyone and best of luck!