Fill in the blanks with the most appropriate word.
The fire was so intense that it took the firemen three hours to _____it _____.
Option C is the correct answer here as this sentence is talking about extinguishing the fire. ‘Put out’ is the phrasal verb used to convey the meaning of dousing the fire. ‘Put away’, ‘find out’ and ‘clear up’ cannot be used here as they would render the sentence meaningless.