What would you do with the apple?

One day at work I was walking through our atrium area to head upstairs to my desk. Our atrium area is a giant, wide open area three stories tall with a sunroof at the top. It has elevator access to all three floors, chairs for people to have informal meetings and some plants to help to cheer people's moods. It is the epicenter of our building - you can't help but walk through it on your way to offices, the cafeteria, manufacturing, and the exit. It's always in pristine condition - cleaned daily.

As I am entering the atrium area there is a woman carrying a tray of food, presumably she is heading back to her desk. She also is carrying her laptop bag. Her hands are obviously full. While she exits, a used apple core rolls off of her tray and onto the floor. The woman pauses and looks up, down, and around to see if anyone has seen the disgustingly brown core fall onto the pristine atrium floor.

She notices nobody, not even me who has just turned the corner. However, given the sheer size of the atrium, it's likely that someone had to see her drop the core.

The big question is, what would you do? Would you
A) Leave the apple core because nobody has noticed (in your mind) or
B) Pick the core up, even though it is difficult to do with your hands full and risk dropping more of your stuff?
C) Something else?

What do you think she did?