Correct Answer: (a) lotus
Solution:The roof of Guru Hemkund Sahib is shaped like an inverted lotus. Hemkund Sahib, officially known as Gurudwara Shri Hemkund Sahib Ji. It is a place of worship and pilgrimage for the Sikhs of the Chamoli region, Uttarakhand, India. It is dedicated to Guru Gobind Singh, the tenth Sikh guru.