(Business: Economics)

An air duct cleaner increases revenues by charging lower prices to townhouse owners than detached house owners because the price elasticity of demand for air duct cleaning services by townhouse owners is ________ and by detached house owners is ________.
Select one:

A.
elastic; inelastic

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B.
elastic; elastic

C.
inelastic; unit elastic

D.
inelastic; elastic

E.
elastic; unit elastic