Final answer:
The most appropriate food choice for a patient recovering from severe vomiting and transitioning from IV fluid therapy to oral intake is dry toast, due to its blandness and easy digestibility. The correct option is 2.
Step-by-step explanation:
The patient in question has been treated with IV fluid therapy for severe vomiting and is now transitioning to oral intake. The most appropriate food choice to begin with in such a case would be dry toast. This is because dry toast is bland, easy to digest, and less likely to irritate the digestive system compared to the other options provided.
Iced tea and hot coffee contain caffeine which can be dehydrating and may stimulate further gastric irritation, while plain yogurt, although generally good for the digestive tract, might be too heavy for a patient just starting to reintroduce food after severe vomiting.