Which of these systems has one unique solution?
A. 4x−3y=1 and 4x−3y=−2
B. 4x−3y=1 and 8x−6y=2
C. 4x−3y=1 and −8x+6y=−4
D. 4x−3y=1 and 4x+3y=1
A. 4x−3y=1 and 4x−3y=−2
B. 4x−3y=1 and 8x−6y=2
C. 4x−3y=1 and −8x+6y=−4
D. 4x−3y=1 and 4x+3y=1