Which operation transformed matrix I to matrix ll?

[1 2 1 |5] [1 2 1 |5]

[0 1 2 |5]-> [0 1 2 |5]

[2 78 |25] [0 3 6 |15]

A. -1/2R3+R1->R3

B. 1/2R3-1->R3

C. 3R2->R3

D. -2R1+R3->