When assessing the motor development of a 24-month-old child, what activity should the mother report?

At 24 months, children typically show significant advances in their motor development, particularly in their ability to manipulate objects. The activity of aligning two or more blocks is a skill that is developmentally appropriate for this age group, demonstrating emerging fine motor skills and hand-eye coordination. At this stage, children are often capable of stacking blocks or manipulating them in various ways, which indicates their growing ability to control their hand movements and engage in more complex play activities.

The other activities listed, while they may be attempted by some children, generally require motor skills that are not typically mastered until later stages. For example, putting on and tying shoes, going to the bathroom without help, and dressing oneself appropriately usually become achievable around 3 to 4 years of age. These skills demand greater independence and coordination, which develop as children continue to grow and practice these tasks. Thus, reporting activity C aligns best with the expected developmental milestones for a 24-month-old child.