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Option 3 : 3
The error lies due to wrong verb being used here.
‘have’ must be replaced with ‘has’. Since there is a single ‘subject of debate’, therefore singular form of verb must be used.
Correct sentence- ‘Whether the Congress erred in privileging members of the old guard to lead the governments in Rajasthan, Madhya Pradesh, and Chhattisgarh has become a subject of debate.’
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