You forgot one question, where is your lease? If you don't own A or B, then you will not drill. If you own only one, you can only drill on the lease your own.
BTW, I would not drill on A or B, both are not good trap, you need to look beyond B.
As for "打构造高部位", it is not always true. Do you hear the term in Texas & Louisiana oil patch, "Bald at the top".