If ç Is the Elasticity of Demand,a Profit Maximizer Sets $\eta$

If ç is the elasticity of demand,a profit maximizer sets a markup price of:

A) MC[1/(1 + 1/ $\eta$ ) ].
B) MC[1/(1 - 1/ $\eta$ ) ].
C) AC[1/(1 - $\eta$ ) ].
D) AC[1/(1 - 1/ $\eta$ ) ].
E) 1/(1 - $\eta$ ) .