Correct Option: D

alleviate (Verb) : to make something less severe ; ease
aggravate (Verb) : to worsen ; to irritate; to make an illness or a bad or unpleasant situation worse; to annoy somebody deliberately depreciate (Verb) : to become less valuable over a period of time
extinguish (Verb) : to put out ; to make a fire stop burning or a light stop shining
subsidise (Verb) : to give money to somebody/an organisation to help pay for something