Correct Answer - Option 1 : M
Given data :
1) Number of people heavier than P is the same as the number of people lighter than Q and L is the heaviest.
L > P > _ > Q > _ or L > Q > _ > P > _
2) K is not the lightest.
L > P > K > Q > M or L > Q > K > P > M
Hence, 'M' is the lightest among all people.