$8.$ In a steady$-$state reactive system, $2$ molar NaCl and $1$ molar H$2$CO$3$ are supplied to the system both at the rate of $100$ mole$/$min$,$ then how much Na$2$CO$3$ produced?

a$)1$ molar

b$)2$ molar

c$)3$ molar

d$)4$ molar