The people of the Indus Valley civilization worshipped Pashupati as their deity. Pashupati is often depicted as a horned figure surrounded by animals, such as tigers or elephants. This indicates a connection to animals and nature. Pashupati is considered an important deity in Hinduism and is associated with fertility, protection, and healing. The worship of Pashupati suggests that the people of the Indus Valley civilization placed importance on the natural world and its cycles. It is important to note that while Vishnu, Indra, and Brahma are all important deities in Hinduism, they were not specifically worshipped by the people of the Indus Valley civilization. So, the correct answer is option 2 - Pashupati.