Choose the option opposite in meaning to the word or phrase underlined.
Before going to bed, make sure you extinguish all the lights.
The correct answer is: C
Explanation
"Extinguish" means to turn off or put out. The opposite of turning off the lights (extinguishing) would be to "switch on" the lights. Therefore, option C is the opposite in meaning to "extinguish."
There is an explanation video available .