The correct answer is (D) To shift; to move to an alternate course; to divert (train, electric current, etc.), particularly to make room for more important traffic; to lay aside; to leave inactive; to sidetrack; to get rid of. Also, to shove or turn something or someone aside.

Shunt comes from Middle English shunten.

Examples of use:

• The freight cars were shunted to a siding.
• They shunted the furniture aside to make space for dancing.