Directions: Fill in the blank with the appropriate word given in the options.

It was _______ of him to behave like that.

"Rude" is the only negative behavior word among options that would explain inappropriate behavior meriting comment. The sentence "It was rude of him to behave like that" is standard English for commenting on bad manners. The other options don't create coherent sentences: "It was young/hard/polite of him to behave like that" don't make semantic sense because these qualities don't characterize the behavior being criticized.