Question

read the passage.
african wild dogs: ultimate predators?
many books, papers, and television shows have created an image of the african wild dog as the ultimate predator. according to these sources, the dogs coordinated teamwork and their unusual endurance help them catch about eighty percent of their prey. a 2012 study tested that notion. researchers fit a pack of wild dogs with special collars that recorde the dogs positions and speeds. the data that the collars recorded allowed the researchers to learn what the dogs did when they werent being observed. the results provided a surprising contrast with the dogs fierce reputation. the dogs never used teamwork in their hunts; they chased their prey over short distances as opposed to long runs; and instead of eighty percent, they brought down only about sixteen percent of their prey.
what is the main, or central, idea of the passage?
african wild dogs have a reputation as fierce hunters who work in teams, but new data suggests otherwise.
a study shows that african wild dogs catch about sixteen percent of their prey and do not use teamwork in hunting.

Explanation:

The passage first presents the common view of African wild dogs as fierce, team - hunting predators. Then it introduces a 2012 study. The study's data (from collars) shows that the dogs don't use teamwork, chase prey over short distances (contradicting the endurance claim), and have a much lower (16% instead of 80%) prey - capture rate. The first option encompasses both the reputation and the new data that challenges it, while the second option only focuses on some of the study's findings and doesn't mention the contrast with the reputation.

Answer:

African wild dogs have a reputation as fierce hunters who work in teams, but new data suggests otherwise.