Consider the following reaction between naphthalene and oxygen in the gas phase with a feed of $200$ mol of naphthalene and $1000$ mol of oxygen in a flow reactor without pressure drop: see the image

The values $$of the parameters "cyte$-$naphthalene" and "cyte$-$oxygen" are respectively?

a$)2$ and $9$

b$)1$ and $0\mathrm{.}2$

c$)2/9$ and $1$

d$)1$ and $5$