Answer : 4. "131"
Explanation :

131 seats are reserved for representatives of Scheduled Castes and Scheduled Tribes in Lok Sabha. Some seats are reserved in Lok Sabha for the members of the Scheduled Castes and Scheduled Tribes. As per the order issued by the Delimitation Commission in 2008, 412 are general, 84 seats are reserved for Scheduled Castes, and 47 seats for the Scheduled Tribes. Hence option 3 is correct. Earlier it was 79 and 41 for Scheduled Castes and Scheduled Tribes respectively.