If Neuroscience Makes Progress, Then the Mind Is the Brain $\lor$

If neuroscience makes progress, then the mind is the brain. If the mind is soul-like, then rational thought is inexplicable. If neuroscience does not progress, then the mind is soul- like. If philosophy of mind is vacuous, then the mind is not the brain and rational thought is explicable. So, philosophy of mind is not vacuous.
-Which of the following propositions is an immediate (one-step) consequence in PL of the given premises?

A) N $\lor$ S
B) ∼∼N $\lor$ S
C) S ⊃ ∼N
D) M ⊃ N
E) N $\lor$ M