What is the bypass factor for the case of sensible cooling?

Question

When 40⁰ and 25⁰C are the dry bulb temperature of air entering and leaving a cooling coil then the cooling coil  temperature is 25⁰C. What is the bypass factor for the case of sensible cooling?

         (a) 0.20               (b) 0.25            (c)0.50             (d) 0.60