In Ladakh, highest population belongs to

Islam
Hinduism
Buddhism
Sikhism

The correct answer is C. Buddhism.

Ladakh is a region in the Indian state of Jammu and Kashmir. It is a predominantly Buddhist region, with about 60% of the population following the religion. Islam is the second largest religion in Ladakh, with about 30% of the population following the religion. Hinduism is the third largest religion in Ladakh, with about 10% of the population following the religion. Sikhism is a minority religion in Ladakh, with less than 1% of the population following the religion.

Buddhism is a religion that originated in India over 2,500 years ago. It is based on the teachings of Siddhartha Gautama, who is also known as the Buddha. Buddhism teaches that suffering is caused by desire and that the way to end suffering is to follow the Eightfold Path. The Eightfold Path is a set of eight steps that lead to enlightenment.

Islam is a religion that was founded by the Prophet Muhammad in the 7th century. It is based on the teachings of the Quran, which is the holy book of Islam. Islam teaches that there is only one God and that Muhammad is his prophet. Muslims believe that they should follow the Five Pillars of Islam, which are: Shahadah (the declaration of faith), Salat (prayer), Zakat (charity), Sawm (fasting during Ramadan), and Hajj (pilgrimage to Mecca).

Hinduism is a religion that originated in India over 4,000 years ago. It is the oldest major religion in the world. Hinduism is a polytheistic religion, which means that it has many gods and goddesses. Hindus believe in reincarnation, which is the belief that the soul is reborn into a new body after death.

Sikhism is a religion that was founded in the 15th century by Guru Nanak Dev Ji. It is a monotheistic religion, which means that it believes in only one God. Sikhs believe in the equality of all people and in the importance of living a simple life.