Best answer: C

Reasoning: By 24 months most typically developing children already use a spoon to feed themselves; inability to do so at 3 years is therefore regarded as a developmental delay. In contrast, hopping on one leg and copying a square are four-to-five-year milestones, and consistently passing a ball back and forth is a social/gross-motor skill that often matures after 3 years, so their absence at exactly 3 years would not yet be labeled delayed [Carruth 2004, PMID 14702018; Kakebeeke 2012, PMID 22913021].