Her stomach felt as heavy as a stone. She swallowed hard before delivering the last line of her presentation. “In conclusion, a recycling program would not only benefit the students, but all the staff as well!” Rebecca hoped her smile didn’t look too forced as she took a step away from the podium. She took a deep breath. Hopefully, they felt the same way about reusing old objects as she did!

What does it mean that Rebecca’s stomach felt “as heavy as a stone”?

She was in pain.

She was nervous.

There were stones being thrown at it.

She was in a comfortable situation.

The phrase "her stomach felt as heavy as a stone" suggests that Rebecca was feeling nervous.