A 3-year-old child typically achieves certain gross motor milestones like climbing stairs with support, pedaling a tricycle, and starting to dress with some help.
Hopping on one foot is a more advanced skill, usually seen in children around 4–5 years of age.
At age 3, balance is still developing and most children cannot yet hop steadily on one foot.
Therefore, option (B) is not an expected milestone for a 3-year-old’s physical development.