Which of the Following Is the Best Example of a Child's

Which of the following is the best example of a child's manipulative skills?

A) Chio navigates around the table by holding onto each chair as she moves.
B) Nigel uses his thumb and forefinger to carefully pick up and eat a small piece of cereal.
C) While her mother shops at the grocery store, two-year-old Allison sits contentedly in the child carrier seat of the grocery cart.
D) Rosita and her father sit on the floor and roll the ball back and forth to each other.