The correct answer is B. Chaitya.
A chaitya is a Buddhist shrine, typically a domed chamber containing a stupa. It is a place of worship and pilgrimage, and is often used for meditation and prayer. Chaitya are found throughout the Buddhist world, from India to Southeast Asia to China and Japan.
A dakhma is a Zoroastrian burial place. It is a circular structure with a high wall, and is used to expose the dead to the elements. Dakhma are found in Iran and India.
A khangah is a Sufi monastery. It is a place where Sufis live and practice their religion. Khangah are found throughout the Islamic world.
An angeri is a Hindu temple. It is a place of worship for Hindus, and is often used for rituals and ceremonies. Angeri are found throughout India and Nepal.
Chaitya are the most closely related to Buddhism of the four options.