Final answer:
The correct position for Mrs. Smith is the semi-fowler's position.
Step-by-step explanation:
The correct position for Mrs. Smith, who is being fed through a nasogastric tube, would be semi-fowler's position. This position involves elevating the head of the bed to 30-45 degrees and maintaining the patient in a semi-sitting position. It helps prevent aspiration during feeding and allows for easier digestion and absorption of the nutrients.