The correct answer is option 1, which is 42 parliamentary seats in West Bengal. Lok Sabha constituency refers to the number of seats allocated for parliamentary elections in a particular region. It represents the number of representatives that a state or region sends to the central government. In this case, West Bengal has a total of 42 Lok Sabha constituencies. This means that there are 42 representatives from West Bengal in the Lok Sabha, the lower house of the Indian Parliament. These representatives are elected by the people of West Bengal during the parliamentary elections. It is important to note that the number of parliamentary seats can vary from state to state, depending on factors such as population size and geographic representation.