The data for feed consumption and weighing gain of four farm animals labelled P, Q, R and S are shown below.

P-50kg feed consumed and 20kg weight gained Q-90kg feed consumed and 30kg weight gained R-100kg feed consumed and 25kg weight gained S - 150kg feed consumed and 30kg weight gained.

The feed conversion efficiency of the poorest weight gainer is

• A 0.4
• B 0.33
• C 0.25
• D 0.2