Correct option is A
The correct option to fill in the blank is (a) has.
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Explanation: The present perfect tense “has badly damaged” is used here to indicate an action that started in the past and has effects on the present. “War” is a singular noun, so it pairs with “has” rather than “have” (Hindi: युद्ध ने बुरी तरह क्षति पहुंचाई).
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Example: The storm has caused severe damage across the region.
Explanation of other options:
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(b) have: Incorrect, as “have” is used with plural subjects, but “war” is singular.
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(c) was: Incorrect tense; “was” does not convey the ongoing impact.
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(d) is: Incorrect tense; does not align with “badly damaged,” which is in the past.