this quEstion rEFErs to thE grAph ABovE．in thE quEstion All rEFErEnCEs to gAsolinE priCEs AnD tAxEs rEFEr to AvErAgE priCEs，inCluDing tAx，AnD AvErAgE tAxEs，in unitED stAtEs DollArs，on junE 1，1989．
iF thE tAx pEr gAllon oF gAsolinE inCAnADA wErE DouBlED AnD thE inCrEAsE in tAx ADDED to thE priCE pEr gAllon oF gAsolinE，whAt pErCEnt oF thE rEsulting priCE pEr gAllon woulD thE tAx thEn BE
A、36%
B、50% C、64%
D、75%
E、90%