In the 10th Lok Sabha, which is the lower house of the Indian Parliament, one state was unrepresented. The correct answer is option 4, Jammu and Kashmir. This means that there were no elected representatives from Jammu and Kashmir in the 10th Lok Sabha.
However, it is important to note that the representation in the Lok Sabha is based on the population of each state. Jammu and Kashmir is a unique case as it has special provisions in the Indian Constitution that grant it a different status. It has its own legislative assembly and a separate set of rules for representation in the Lok Sabha.
It is also worth mentioning that the representation in the Lok Sabha is subject to change after each general election. So, while Jammu and Kashmir may have been unrepresented in the 10th Lok Sabha, it does not necessarily mean that it was unrepresented in subsequent Lok Sabhas.
In conclusion, the correct answer is option 4, Jammu and Kashmir, which was unrepresented in the 10th Lok Sabha.