Which fact provides support for the "nature" side of the nature/nurture debate and why? A :
Failed attempts to teach chimpanzees how to use human sign languages demonstrate that nature is often inflexible to environmental input.

B :
Hopi infants are often carried in a cradleboard and therefore do not crawl and walk freely on the ground, but their motor skills by age one are very similar to those of other infants who have not been restrained. This demonstrates that the maturation of motor development is programmed.

C :

Ducklings imprint the first moving object they see after they are born, even if this object is a human or a robot, which demonstrates that the environment context is more important than other factors.

D :
Genie, the "wild child," was isolated and abused for many years, but she was still able to learn a language after she was rescued because the human brain is programmed for linguistic abilities.