Moira solved a problem on the board. What error did Moira make and how can she correct it?

12x + 10 = 54 - 10x
12x + 10 - 10 = 54 - 10x - 10
12x = 44 - 10x
12x - 10X = 44 - 10x + 10x
2x = 44
X = 22

A- On the left side of the equation, Moira should have subtracted 10x, and on the right side of the equation, Moira should have added 10x.

B- On the left side of the equation, Moira should have added 10x, and on the right side of the equation, Moira should have subtracted 10x.

C- On the left side of the equation, Moira should have added 10x, and on the right side of the equation, Moira should have also added 10x.

D- On the left side of the equation, Moira should have subtracted 10x, and on the right side of the equation, Moira should have also subtracted 10x.

Please I really need it