Final answer:
The typical child in the Iranian orphanage could not sit up unassisted at age 2 or walk at age 3, aligning with typical child development milestones for toddlers and preschoolers.
Step-by-step explanation:
In the Iranian orphanage, the typical child could not sit up unassisted at age 2; or walk at age 3. This is based on the milestones of child development where by age two, toddlers can typically walk sidewards, backward, and can walk up and down stairs holding on to a rail or someone's hand. By age three, gross motor skills have advanced to the point where children are good at climbing and can climb stairs one foot per step without assistance. Toddlers also develop fine motor skills such as handling small objects and doing simple puzzles by this age. Since these milestones are generally achieved by the ages of two and three respectively, option c) 2; 3 would be correct.
It is important to note that there can be variations in development due to factors such as health conditions, or the child's environment. The information given reflects typical developmental milestones for toddlers and preschoolers without taking into account individual differences or possible developmental delays.