Final answer:
The most likely emotion you would feel when opening a birthday card from your grandma and money falls out is gratitude. Correct option is C.
Step-by-step explanation:
When you open a birthday card from your grandma and money falls out, the most likely emotion you would feel is C) Gratitude. Opening a birthday card from your grandma and finding money inside is a kind and thoughtful gesture that is often associated with gratitude. While there might be an initial sense of excitement and surprise (option A), the common response is gratitude for the gift.
Confusion (option B) and disappointment (option D) are less likely emotions in this scenario, as receiving money is typically viewed as a positive occurrence.