Manny looked all over the house for his library book. It was due today and he couldn't find it anywhere.
"Mom, have you seen my library book, the one with the red cover?"
"You mean this one?" Mom said as she pulled it out of his backpack.
Manny's eyes popped. "Yes, that's the one! I can't believe I didn't look in my own backpack!"
mat is the most likely meaning of "Manny's eyes popped" as it is used in the passage?
1. Manny was surprised.
2. Manny was tired of looking.
3. Manny recognized the book.
4. Manny felt very uncomfortable.