Held and Hein Raised Kittens in Complete Darkness for a Few

Multiple Choice

Held and Hein raised kittens in complete darkness for a few weeks.After the initial period of darkness, the kittens were divided into two groups (passive or active) .Both groups were still kept in darkness most of the day, but now spent an hour a day on a "kitten carousel." They found that ______.

A) active kittens could not move along the carousel based on visual input
B) each kitten was able to learn the visual task
C) active kittens were more likely to avoid a "visual cliff" than were passive kittens
D) passive kittens developed the inability to recognize motion