Final answer:
The correct statement indicating an understanding of medication administration in children is that drugs effective in adults may not work in children, even if the dose is proportional for weight and size.
Step-by-step explanation:
The statement that indicates an understanding of medication administration in children is: 1) "Drugs effective in adults may not work in children, even if the dose is proportional for weight and size."
This statement is correct because it acknowledges that drugs may have different effects in children compared to adults, even if the dosage is adjusted for weight and size. It recognizes the importance of considering factors beyond just the dose when administering medication to children.