In Haber process 30 litre of dihydrogen and 30 litres of dinitrogen were taken for reaction which yielded only`50%` of the expected product. What will be the composition of gaseous mixture under the aforesaid condition in the end ?
A. 20 litres `NH_3`, 25 litres `N_2`, 20 litres `H_2`
B. 10 litres `NH_3`, 25 litres `N_2`, 15 litres `H_2`
C. 20 litres `NH_3`, 10 litres `N_2`, 30 litres `H_2`
D. 20 litres `NH_3`, 25 litres `N_2`, 15 litres `H_2`