Choose the equivalent system of linear equations that will produce the same solution as the one given below.

6x + 2y = −6
3x − 4y = −18

A. 12x + 4y = −12
15x = −30
B. 8x + 4y = −4
14x = −10
C. 6x − 8y = −36
−6y = −42
D. 6x + y = 15
3y = 9