Time Travel. Is it possible? When you look at it, no. Why? Time travel is going back in time. To do this, you would have to undo everything. Everything. The universe is so big we can only imagine It. The part that we know, the milky way is less than a thousandth of it. You would have to undo everything in existence, and at the moment we don't even know everything in existence. We are closer to growing gills then time travel.
Answer:
I'm pretty sure the answer would be B.
The point of view in this excerpt is definitely third person, because nouns such as Dorothy, and pronouns such as she are used throughout to indicate third person.
However, if you also need to decide whether it is limited or omniscient, I'd choose limited - because we can only see what she is doing, and not what she is thinking and feeling.