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The subject of the sentence is "Several petitions," which is plural. However, the verb "was referred" is in the singular form, which is incorrect. It should be "were referred" to match the plural subject. Option A ("were referred to a Constitution Bench in 2019") correctly uses the past tense "were referred" to indicate the action that happened in 2019. Option B ("referred a Constitution Bench in 2019") is not grammatically correct because it lacks the appropriate auxiliary verb "were" to indicate the past tense. Option C ("were referred to Constitution Bench in 2019") is incorrect because it is missing the article "a" before "Constitution Bench." The correct phrasing is "a Constitution Bench."