Correct answer should be A,B. The main role is of the steric hindrance between the halogen atom and the tert-butyl group. So why are we even considering the electronic effects of both the groups? They are common in all the cases.
Further, the answer should be A only as its only the halogen atom changing each time, and hence the steric hindrance due to it. Why are we even considering other factors, as they are common in all the cases?