Considering the Relative Solvation of Reactants and the Transition States $\rightarrow$

Considering the relative solvation of reactants and the transition states of substitution reactions of these reactants,predict which general type of reaction would be most favored by the use of a polar solvent.

A) Y: + RX $\rightarrow$ RY⁺ + X:^-
B) Y:^- + RX $\rightarrow$ RY + X:^-
C) Y: + RX⁺ $\rightarrow$ RY⁺ + X:
D) Y:^- + RX⁺ $\rightarrow$ RY + X:
E) RX⁺ $\rightarrow$ R⁺ + X: