What were the consequences of the partition in cities like Lahore, Amritsar, and Kolkata?

Formation of communal zones.

The correct answer is Option 4 - Formation of communal zones.

The partition of India refers to the division of British India into two separate nations: India and Pakistan. It occurred in 1947, following the end of British colonial rule in the Indian subcontinent. The partition was primarily based on religious lines, with the creation of a separate Muslim-majority state, Pakistan, to address the demands of the Muslim League for a separate homeland.
Because of the partition of India, major cities like Lahore, Amritsar, and Kolkata became divided into communal zones, where people from different religious communities avoided entering areas dominated by the other community. This division created physical and psychological barriers between communities that had once lived together.