Which of the Following Statements About How Infants Learn About

Which of the following statements about how infants learn about gravity is true?

A) Very young infants have an initial, simple concept on which they gradually build more and more complex understandings over their first year.
B) Older infants have an initial, simple concept on which they gradually build more and more complex understandings over their second year.
C) Very young infants have an initial, simple concept to which they rapidly add the remaining understanding over a very short time.
D) Older infants have an initial, simple concept to which they rapidly add the remaining understanding over a very short time.