The author's word choice gives the reader insight into the dialect of the speaker. The written pronunciation of some words show what the character would sound like speaking, which gives an indication of where they are from or what they're like.
Answer: B
Explanation: If you look at the graph and consider 1 space 10 minutes, we see that she is walking for 30 minutes. The resting is a flat line because she isn't traveling. Finally, the line on the right side is steep to indicate she is walking faster.