Correct Answer: Commence

Solution : The second option is correct.

Abort means to terminate or stop a process, mission, activity, or development before its completion.

Commence means to begin or start something. So it is the appropriate antonym that conveys the idea of initiating or starting something.

The meanings of the other options are as follows:

• A commode is a piece of furniture containing a concealed chamber pot, a chest of drawers, or a chiffonier of a decorative type.
• Command refers to an authoritative order or instruction.
• Collision refers to a forceful impact or clash between two or more objects.

Therefore, the correct answer is commence.