Correct choice is (a) Pikovskaya’s Agar
Easiest explanation: Pikovskaya’s Agar is a very special type agar that is used to isolate phosphate solubilizing bacterial species. The isolates can be isolated on Pikovskaya’s Agar after few hours-days of incubation. Gelatin Agar, Macconkey Agar, LB Agar is not used to isolate phosphate solubilizing bacterial Species.