How Would the Rescorla-Wagner Model Account for Overshadowing in a Situation

Multiple Choice

How would the Rescorla-Wagner model account for overshadowing in a situation in which a loud tone conditions better than a dim light when they are conditioned in compound?

A) The model would have to be revised, as it cannot currently account for overshadowing.
B) It would use a different λ for each CS.
C) It would use two different α's and two different 's
D) It would assume that α is greater for the more salient CS.