The Tropic of Cancer passes through 8 Indian states: Gujarat, Rajasthan, Madhya Pradesh, Chhattisgarh, Jharkhand, West Bengal, Tripura, and Mizoram. It does NOT pass through Assam - it passes just south of Assam's border through Mizoram. While many other states are also not passed by the Tropic of Cancer, Assam is specifically listed among the options and is the correct choice in this context.