Final answer:
The characteristic of physical development for a 30-month-old child is that their primary dentition is complete. Toddlers usually have their full set of baby teeth by this age, but they reach their weight and height milestones by the first birthday. The correct option is A.
Step-by-step explanation:
The correct characteristic of physical development for a 30-month-old child is that their primary dentition is complete. At this age, most toddlers will have their full set of 20 baby teeth.
It's important to note that toddlers don't triple their birth weight and double their height until their first birthday, typically. As for the fontanels, by 30 months, both the posterior and anterior fontanels have usually closed.
Finally, while children may show a preference for one hand over the other, left- or right-handedness may not be firmly established until slightly later in childhood.
Toddlers experience rapid developmental changes, and one can expect a 30-month-old to demonstrate a wide range of physical and cognitive skills, including speaking in short sentences, running, and starting to show signs of toilet training readiness.
Regarding the dentition, the arrival of baby teeth usually begins around six months of age with the upper and lower incisors and culminates by the age of 30 months when the full set of primary teeth has typically emerged. The correct option is A.