The Demand Function for a Certain Make of Exercise Bicycle

Multiple Choice

The demand function for a certain make of exercise bicycle sold exclusively through cable television is , where p is the unit price in hundreds of dollars and x is the quantity demanded/week. ​
Compute the elasticity of demand and determine the range of prices corresponding to inelastic, unitary, and elastic demand.
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A) ; for demand is inelastic; for demand is unitary; for demand is elastic
B) ​ ; for demand is inelastic; for demand is unitary; for demand is elastic​
C) ​ ; for demand is inelastic; for demand is unitary; for demand is elastic​
D) ​ ; for demand is inelastic; for demand is unitary; for demand is elastic​