The word IGNITE means to set something on fire or start something, so the opposite for this word will be Extinguish which means to put out a fire or stop something.
The correct option is (C): Extinguish
Even though in official statements, the Presidential office has warned against violating the 25th protocol, the government's inaction against the Market group shows the government's tacit approval of the movement. (Choose the antonym of the underlined word)