The major religion in Punjab is:

Sikhism
Hinduism
Islam
Christianity

The correct answer is: a) Sikhism.

Sikhism is the fifth-largest organized religion in the world, with over 30 million followers. It was founded in the 15th century by Guru Nanak Dev Ji, who taught that there is one God and that all people are equal. Sikhism emphasizes the importance of living a moral and ethical life, and of serving others.

Hinduism is the oldest major religion in the world, with over 1 billion followers. It is a polytheistic religion, with a belief in many gods and goddesses. Hinduism emphasizes the importance of karma, or the law of cause and effect, and of reincarnation, or the belief that the soul is reborn into a new body after death.

Islam is the second-largest religion in the world, with over 1.8 billion followers. It is a monotheistic religion, with a belief in one God. Islam emphasizes the importance of prayer, fasting, charity, and pilgrimage to Mecca.

Christianity is the largest religion in the world, with over 2.4 billion followers. It is a monotheistic religion, with a belief in one God. Christianity emphasizes the importance of love, forgiveness, and salvation.

Punjab is a state in northwestern India and eastern Pakistan. The majority of the population in Punjab is Sikh.