Almost every major city in the world has a zoo. humans have kept and enjoyed animals since the prehistoric times. ancient greeks and romans kept small zoos. over the past fifty years, zoos have changed remarkably. today zoos provide the animals with larger and more natural habitats.

which sentence could be added to the passage as a supporting detail?
a) zoos also provide great research facilities.
b) the panda's favorite food is the bamboo shoot.
c) you can reach the zoo in sydney, australia by ferry.
d) the greeks and romans had a variety of interesting hobbies.