A nurse is assessing a 15-month-old toddler. Which of the following findings should the nurse report to the provider?

A. By 15 months, a toddler typically can build a tower of two to three cubes; a tower of six to seven cubes is expected closer to 24 months. B. Jumping with both feet is generally expected closer to age 2-3 years. C. By 15 months, a toddler should be able to stand upright without support. Failure to do so could indicate a delay in motor development. D. Turning a doorknob is a skill that develops later, around age 2-3 years.