Which form of tough best completes the sentence?

what was the game you have competed in?

a.
more tough

b.
toughest

c.
tougher

The form of the word "tough" that best completes the sentence is option B. toughest. So the complete sentence would be: What was the toughest game you have competed in? When we add the suffix -est at the end of the base form of an adjective word, it means it is comparing in a superlative degree. 

U