How Do Researchers Know That Infants Can Integrate Touch and Vision

Multiple Choice

How do researchers know that infants can integrate touch and vision early in life?

A) After infants are allowed to suck on either a smooth or a bumpy pacifier, they prefer to look at the one they had previously sucked on.
B) Infants like to touch soft items when compared to hard items.
C) Infants reach for a toy and try to put the toy in their mouth.
D) After infants see an object, they will show a preference for that object in pictures.