(A) Gopal is shorter than Ashok but taller than Kunal;
(B) Navin is shorter than Kunal;
(C) Jayesh is taller than Navin;
(D) Ashok is taller than Jayesh. Who among them is the tallest ? 

Answer: B. Ashok

In terms of height, we have :
Gopal < Ashok,  Kunal < Gopal,  Navin < Kunal, Navin < Jayesh,  Jayesh < Ashok.
So the sequence becomes :
Navin < Kunal < Gopal < Jayesh < Ashok.

Clearly, Ashok is the tallest.