Option 1: Manipur is one of the states in India, but it is not the state with the lowest population as per Census 2011.
Option 2: Tripura is another state in India, but it is not the state with the lowest population as per Census 2011.
Option 3: Puducherry is a union territory in India, but it is not considered a state. Therefore, it is not the state with the lowest population as per Census 2011.
Option 4: Sikkim is the correct answer. According to Census 2011, Sikkim had the lowest population among all states in India. It is a small state with a population of only around 6 lakh people.
Therefore, the correct answer is option 4 - Sikkim.