Correct Answer - Option 2 : O
Given
1. J, K, L, M, N and O are six colleagues working in an NGO.
2. J earns more than L but less than M.
M > J > L
3. N earns less than O but more than M.
O > N > M > J > L
4. K earns more than J but less than N.
5. K earns less than M.
O > N > M > K > J > L
So, the final arrangement is
O > N > M > K > J > L
So, O earns the most among the six.
Hence, the correct answer is "O".