What punctuation mark should be used after ‘Hurrah’?
Hurrah We have won.

Correct option is C

Correct punctuation mark: (c) Mark of exclamation (!)
Why (in detail):
• “Hurrah” expresses sudden joy/excitement, so it is an interjection.
• Interjections showing strong feelings end with (!).
Grammatical Rule (English):
• Interjections expressing strong emotion are followed by exclamation mark (!).
व्याकरणिक नियम (Hindi):
• हर्ष/उत्साह जैसी भावना व्यक्त करने वाले interjection के बाद विस्मयादिबोधक चिन्ह (!) लगाया जाता है।
Hence, option (c) is the correct answer.