The Varaha avatar of Vishnu is often depicted as a boar, symbolizing strength and courage. In this form, Vishnu is said to have dived into the cosmic ocean to rescue the Earth goddess, Bhudevi. The sculpture from Aihole in the sixth century would likely showcase Varaha with a boar's head and a human body, carrying Bhudevi on his tusks. The imagery represents the triumph of good over evil and the divine protection of the Earth. The details in the sculpture would capture the essence of this mythological narrative, conveying a sense of power, heroism, and the sacred significance of the Varaha avatar.

So, the correct option is [2].