Which of the following is one of the motor-scale items from the Bayley test?

A) The infant glances back and forth from a rattle to a bell.
B) The infant removes cup to obtain an item hidden underneath.
C) The infant builds a tower with two cubes.
D) The infant raises self to a sitting position.

The Bayley Scales of Infant and Toddler Development include a variety of items to assess motor skills, among other areas. The ability of an infant to raise themselves to a sitting position is a motor skill that would be assessed in such developmental scales, reflecting the child's physical development and muscle control.