Stay away!
Where the met conditions exist to create rotors, the best advice for pilots of light a/c is to stay well clear of high ground. Answer D will get you the pass mark, but in truth flying in, above or below rotors will create sufficient turbulence to make it feel severe for you. Don't buy it, but if you get the opportunity have a dip into the HMSO Handbook of Aviation Met to see just what damage can occur to even a test a/c in these conditions. Browse a little further and you will see the formation of moutain waves and rotoring is a hugely complex subject, and doesn't lend itself to writing simplistic questions (or answers for that matter)