To answer the question about when infants can sit with support, we need to reference standard developmental milestones for infants.
1. Infants typically begin to gain the necessary muscle strength and coordination to sit with support around a certain age.
2. According to developmental guidelines, this age is approximately six months.
Therefore, the detailed step-by-step reasoning leads to the conclusion that infants can sit with support when they're approximately:
C. six
months old.
