It can be inferred that research conducted at zoos has led to increasing the lifespans of zoo animals. Which detail from "The Importance of Zoos" best supports this inference?

"By studying zoo animals, scientists have discovered new medicines and new techniques to improve the health of animals living in captivity and in the wild."

"Zoo animals receive expert medical care."

"Studies show that some zoo animals have longer lifespans than they would in the wild."

"Organizations like the American Humane are working with zoos to set standards, or rules, to ensure animals receive the best care."