The Municipal Council can no longer wash its hands off its responsibilities.

This question tests idiomatic expressions and pronoun agreement with collective nouns.

The idiom "wash one's hands of something" means to refuse responsibility for something—like saying "I'm done with this mess!" Municipal Council is a singular collective noun (like "team" or "company"), so it takes the singular pronoun "its," and the idiom specifically requires the preposition "of."

Option 1 → Wrong preposition—you wash hands "of" problems, not "from" them.

Option 2 → "Their" treats council as plural, plus wrong preposition "off."

Option 3 → "Their" is wrong, and it's "hands" not "hand" in idioms.

Option 4 → Perfect idiom with correct singular pronoun agreement—nails it!