We know that,
17 students/volunteers
Atleast 3 clubs
Drama club -> 5 volunteers
Chess club -> 4 volunteers
=> Remaining volunteers in other clubs = 17 - 9 = 8
Statement 1->
Robotics club -> 3 volunteers
Art club -> 2 volunteers
=> Remaining students for the other club = 8 - 3 - 2 = 3 volunteers
Now this can have multiple cases like [5,4,3,2,3] , [5,4,3,2,1,1,1], [5,4,3,2,1]
All of these will produce different number of teams
Statement 1 is insufficient
Statement 2->
Given that drama(5) and chess(4) club have more than 3 students, we can say that the remaining clubs need ot have exactly one club with less than 3 students/volunteers
Multiple distribution cases are possible for this statement such as
Case 1: [5,4,1,7]
Case 2: [5,4,2,3,3]
So we can say that,
Statement 2 is insufficient
Combining 1 and 2 ->
We know that
4 clubs are established with their volunteers which are ->
Drama [5] , Chess [4], Robotics [3] , Art [2]
We also know that only one club can have less than 3 members and art satisfies that criteria
=> The only possible remaining combination for the remaning 3 students is to be stacked as a 3 member team in another club as volunteers
=> New combination = [5,4,3,2,3]
Exact count of teams can be determined from this
C. Both statements together are sufficient but neither alone are enough