Final answer:
The nurse should offer oral rehydration solution to a toddler with acute diarrhea and moderate dehydration.
Step-by-step explanation:
When a toddler has acute diarrhea and moderate dehydration, the nurse should offer D) Oral rehydration solution. This solution is a carefully prepared electrolyte solution that helps replace the fluids and electrolytes lost during diarrhea. It contains water, salts, and sugar to aid in rehydration and is effective in preventing further dehydration.