Answer: D.24
Step-by-step explanation: Since there are 4 types of animals in the zoo and there are 48 animals in total. We have to do: 48 ÷ 4 = 12
That means there are 12 lions, 12 parrots, 12 iguanas, and 12 snakes.
But if there were no iguanas or snakes, we would have to do 12 x 2= 24.
Hence, the answer is D. 24