gmat逻辑题
Thepriceofmaplesyruphasjumpedfrom22dollarsthreeyearsagoto40dollarsagallontoday.Itcanbeconcludedthatmaple-syrupharvestershavebeenartificiallyinflatingpricesandthatgovernmentalpriceregulationsarenecessarytocontrolrisingprices.Whichofthefollowing,ifture,caststhemostdoubtontheconclusiondrawnabove?
(A)Thegovernmentalreadyrequiresmaple-syrupharvesterstosubmittheirfacilitiestolicensingbythehealthdepartment.(B)Insectinfestationanddroughthavestuntedthegrowthofsyrupproducingmapletreesandcausedless-abundantsyrupharvests.
(C)Maplesyrupisproducedinruralareasthatsufferfromhighunemployment.
(D)Technologicalimprovementsinmaple-syrupharvestinghavereducedproductioncosts.
(E)Maple-syruppriceshaverisenmanytimesinthepast,thoughneverbeforeattheraterecentlyobserved.