For the liquid phase parallel reactions__________________?

R, rR = K1.CA2; E1 = 80 KJ/mole
S, rs = K1.CA ; E2 = 120 KJ/mole
The desired product is R. A higher selectivity of R will be achieved, if the reaction is conducted
at
A. Low temperature in a CSTR
B. High temperature in a CSTR
C. Low temperature in a PFR
D. High temperature in a PFR