Consider the gas$-$phase isothermal isomerization reaction, $AB.$ Two CSTRS and two PFRs each have a volume of $1\mathrm{.}6m^3.$ Use the given data below to calculate the conversion for each of the reactors in the following arrangements. The entering molar flow rate of $A$ is $0\mathrm{.}4mo\frac{l}{s}.$

$\backslash$table$[[x,0,0\mathrm{.}1,0\mathrm{.}2,0\mathrm{.}4,0\mathrm{.}6,0\mathrm{.}7,0\mathrm{.}8],[-r_A(mo\frac{l}{m^3}*s),0\mathrm{.}45,0\mathrm{.}37,0\mathrm{.}3,0\mathrm{.}195,0\mathrm{.}113,0\mathrm{.}079,0\mathrm{.}05]]$

a$)$ Two CSTRs in series.

b$)$ Two PFRs in series.

c$)$ Two CSTRs in parallel with the feed, $F_{A0},$ divided equally between the $2$ reactors.

d$)$ Two PFRs in parallel with the feed, $F_{A0},$ divided equally between the $2$ reactors.

e$)$ A PFR followed by a CSTR in series.

please give me a clear answer.