Which sentence is punctuated correctly?
A: I used the green pen not the red one for my homework.
B: used the green pen, not the red one, for my homework.
C: I used the green pen, not the red one for my homework.
A: I used the green pen not the red one for my homework.
B: used the green pen, not the red one, for my homework.
C: I used the green pen, not the red one for my homework.