On a Certain Supply Curve,one Point Is (Quantity Supplied =

On a certain supply curve,one point is (quantity supplied = 200,price = $4.00) and another point is (quantity supplied = 250,price = $4.50) .Using the midpoint method,the price elasticity of supply is about

A) 0.22.
B) 0.53.
C) 1.00.
D) 1.89.