Knowing that the selectivity is given by: Spru = (k1/k2) Co/CA, the reactor that will increase formation of D is Select one: a. CSTR reactors in series where A is split and fed to each reactor and B is fed once to the first reactor b. None C. CSTR reactors in series where B is split and fed to each reactor and A is fed once to the first reactor d. A membrane reactor where B is fed into side streams to the reactor and A is fed once to the first reactor