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

A. Jumping with both feet is a skill typically developed around 2-3 years, so it is not expected for a 15-month-old toddler. B. By 15 months, a toddler should be able to stand upright without support. The inability to do so may indicate developmental delays or underlying neurological or musculoskeletal issues. C. Turning a doorknob is a fine motor skill that typically develops around 2-3 years, so it is not expected for a 15-month-old toddler. D. Building a tower of six to seven cubes is a skill typically developed around 2 years, so it is not expected for a 15-month-old toddler.