Correct Answer: destroy

Solution : The correct choice is the third option .

Conserve means to protect something from harm, whereas destroy means to damage something in a violent way, after which it cannot be used. Both of the words imply opposite actions and, hence, are antonyms.

The meanings of the other options are as follows:

• Maintain means to continue the existing state.
• Support means to give assistance.
• Preserve means to maintain something in its original state.