The Figure Above Shows the Supply Curve for Roses

Multiple Choice

The figure above shows the supply curve for roses.
-Suppose a decrease in supply raises the price from $4.00 to $5.50 and decreases the quantity demanded from 2,000 to 1,500.Using the midpoint method,the elasticity of demand equals

A) 2.10.
B) 1.11.
C) 0.90.
D) 0.72.
E) None of the above answers is correct.