In Haber process 30 litres of dihydrogen and 30 litres of dinitrogen were taken for reaction which yielded only of the expected product. What will be the composition of gaseous mixture under the aforesaid condition in the end?

(a) 20 litres ammonia, 20 litres nitrogen, 20 litres hydrogen

(b) 10 litres ammonia, 25 litres nitrogen, 15 litres hydrogen

(c) 20 litres ammonia, 10 liters nitrogen, 30 litres hydrogen

(d) 20 litres ammonia, 25 litres nitrogen, 15 litres hydrogen