一道英语完型填空,选哪个,求详细说明理由

一道英语完型填空,选哪个,求详细说明理由
The evidence for Mozart therapy turned out to be weak, perhaps nonexistent, although the original study never claimed anything more than a temporary and limited effect. In recent years, however , scientists have examined the benefits of a concerted effort to study and practice music, as _______ to playing a Mozart CD or a computer-based“brain fitness” game once in a while.A)opposed B)accustomed C) related D)devoted