Explanation
Why Correct: The West Bengal Legislative Council was abolished in 1969 through the West Bengal Legislative Council (Abolition) Act, 1969.
Distractor Analysis: In 1965, the Punjab Legislative Council was abolished. In 1967, the United Front coalition government formed in West Bengal after state elections. In 1971, the Bangladesh Liberation War concluded with Pakistan's surrender.
Takeaway: Only six Indian states currently maintain Legislative Councils: Andhra Pradesh, Bihar, Karnataka, Maharashtra, Telangana, and Uttar Pradesh.