For the following question, arrange the sentences A, B, C, and D to form a logical sequence.
(A) People can get infected by handling reptiles and then touching their mouths or an open cut.
(B) At first, they look like the perfect pets: exotic, quiet and tidy.
(C) A study estimates that in 1995, there were as many as 6,700 reptile-caused salmonella infections.
(D)
But lizards and other pet reptiles can harbor salmonella bacteria that make people sick.