Strike_Kaplan revision kit Q68

I do not have the Kaplan Kit (only the BPP Revision Kit) and so unless this was a past exam question (in which case tell me which exam), I am unable to help you with the specific question. With options, there is no 'best' strike price - different strike prices will reduce the limit but will cost more. In the exam (unless told otherwise) you are expected to show (and discuss) the calculations for all the available strike prices. If you have not watched them, then my free lectures on this will help you.