banni, did you end up reporting this question to schweser? i just came across it in qbank and rememebred reading this post and was wondering if you got confimration of an error, because I believe the answer is A.
The answer is clearly A because basis=spot-future price, Schweser is clearly wrong (as usual) because they FUCKING SUCK!!!
Thank goodness for this posting because this schweser question was driving me crazy as it clearly contradicted the reading material