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x=8y+12 and x=12u then 12u=8y+12 or y=[12*(u-1)]/8 or y=[3*(u-1)]/2 since u ia an integer when u=1 y=0 x=12 the greatest GCD is 12 when u=3,y=3 x=36 GCD is 3 so A) is insuff
Same reasoning can be applied to B)
Even when combined A) and B) are not enough So E) is my choice