Which of the following statement on flying buttress of Gothic architecture is not correct?

Exposuretosustainednoisehasbeenclaimedto_____bloodpressureregulationinhumanbeingsand,particularly,toincreasehypertension,eventhoughsomeresearchershaveobtainedinconclusiveresultsthat_____therelationship. A: sharpen B: increase C: impairii. D: buttress E: obscure F: neutralize