Correct option is D
1,2,3,4,5,6 are the six cakes.
Only two cakes are heavier than 4. So,4 is the third heaviest.
2 is heavier than 1 but lighter than 6.
6 is lighter than 4.
3 is not the heaviest cake.
Order of weights:
Using the above logic, the correct order of cakes by their weight is:
1<2<6<4<3<5 The heaviest cake is 5.
Thus, correct option is (d).