Based on the situation in the sentence, select the most appropriate idiom.
After many years of rivalry, the two schools decided to _______ and participate in a National Event together.

Correct option is C

Explanation:
The sentence describes ending a rivalry and choosing to work together, which clearly hints toward reconciliation.
Idiom meanings:
· (a) Be in the doldrums – to feel sad or depressed → Not suitable
· (b) Go cold turkey – to suddenly stop a bad habit, especially addiction → Irrelevant
· (c) Bury the hatchet – to end a conflict and make peace → Perfect fit
· (d) Bell the cat – to attempt a risky or dangerous task → Doesn't fit context
Usage example:
The two nations finally decided to bury the hatchet after years of hostility.
Correct answer: (c)