B is correct.
Okay, that was too easy. Now, let's stop and think
about the plane. We might imagine creatures in the plane. These
would be shapes and they might float around in the plane. There are
many things that 2-dimensional creatures can do that 1-dimensional
creatures cannot do, but still there are limitations to being
2-dimensional. Can you think of something that a 2-dimensional
creature would have a lot of trouble doing?
![](thinkandturn.jpg)