Read the following context and choose the best option to answer the question.
Context: She 's big on magic wands and transformation right now . Em felt she was running a little late , so she said , " We 'll walk quickly . " She did . I had to stretch my legs a bit to keep her pace , and she was shorter than me by a foot and was wearing a pack .
Question: Why is it interesting to know Em 's height ?
Options: 
- A tall person can cover distance quickly , presumably Em will be slow .
 - None of the above choices .
 - Em did a little magic with the wand to make herself short .
 - Em transformed into a person one foot shorter and walked quickly .


A tall person can cover distance quickly , presumably Em will be slow .