Select the correct answer.
Which sentence would best be added to develop the idea that the Philadelphia Zoo was the first zoo in the country?
The Philadelphia Zoo
The Philadelphia Zoo is the oldest zoo in the United States. In 1859, the members of Philadelphia's Zoological Society established a charter to found a zoo on garden-like acreage in the city. Because civil war was looming between the North and South, the zoo did not open until 1874. . The same gates that opened to visitors in the late nineteenth century still grace the zoo today. The zoo property also includes a mansion that was built by John Penn, a grandson of Pennsylvania's founder William Penn.
A. Frank Furness, an architect, helped build the zoo.
B. When the zoo first opened, it housed 813 animals.
C. Dr. William Carmac led the efforts to build the zoo.
D. Now, the zoo welcomes over a million visitors each year.