Which best describes bias, if any, from the sample surveyed? 
 survey: favorite vacation locations 
 sample: randomly selected visitors to a national park
 A.
 Since the sample is randomly selected, there is unlikely to be any bias.
 B.
 Since the people surveyed are visiting a national park, they may be biased against vacations close to home.
 C.
 Since the people surveyed are visiting a national park, they may be biased towards national parks.
 D.
 Since a large number of people visit national parks, the sample should be large enough to eliminate any bias.