What reactor$/$reactors scheme and conditions would you use to maximize the selectivity parameters

the following parallel reaction?

$A+C{k}_{D}D$ desired $r_D=800e^{\frac{-2000}{T}}{C}_A^{0\mathrm{.}5}{C}_C$

$A+C{k}_{U}U1$ undesired $r_{U_1}=10e^{\frac{-300}{T}}{C}_A{C}_C$

a$)$ To maximize the production of the desired product, the temperature should be

b$)$ To maximize the production of the desired product, $C_A$ should be

c$)$ What reactor$/$reactors scheme and conditions would you use to maximize the selectivity parameters

for the following parallel reaction?

d$)$ How does the selection of reactor$/$reactors scheme and conditions change if D can react with C and

form another undesired product?

$A+C{k}_{D}D$ desired $A+C{k}_{U1}U1$ undesired $A+C{k}_{U2}U2$ undesired

$r_D=800e^{\frac{-2000}{T}}{C}_A^{0\mathrm{.}5}{C}_C,r_{U_1}=10e^{\frac{-300}{T}}{C}_A{C}_C,r_{U_2}={10}^6{e}^{\frac{-8000}{T}}{C}_C{C}_D$