The theoretical physicist, despite his mathematical training, oftentimes must deal with questions that fall under the realm of the philosophical. Nonetheless, he will often marshal formulae when they serve to (i)____________ a theory, notwithstanding the fact that many such theories are not (ii)____________ empirical analysis, as those theories deal with questions whose answers may ultimately be unknowable. A. undermine B. unrelated to C. conflate D. commensurate with E. undergird F. amenable to