Which of the Following Horizontal Lists Is Punctuated Correctly

Which of the following horizontal lists is punctuated correctly?

A) To remove the six gearbox socket cap screws, follow these steps: remove the two bottom screws, remove the two middle screws, and remove the two top screws.
B) To remove the six gearbox socket cap screws, follow these steps: (1) remove the two bottom screws, (2) remove the two middle screws, and (3) remove the two top screws.
C) To remove the six gearbox socket cap screws, follow these steps: (a) remove the two bottom screws, (b) remove the two middle screws, and (c) remove the two top screws.
D) To remove the six gearbox socket cap screws, follow these steps: remove the two bottom screws; remove the two middle screws; and remove the two top screws.