What does the idiom mean in: "The final exam was a hard nut to crack."?

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A Easy to complete
B A difficult problem to solve
C A boring topic
D A crunchy snack

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Answer: B. A difficult problem to solve

Answer: B. A difficult problem to solve
Explanation: A "hard nut to crack" describes a difficult task or a difficult person to deal with.

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What does the idiom mean in: "The final exam was a hard nut to crack."?

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