Read the following context and choose the best option to answer the question.
Context: Who : Edward and StaffWhat : ArrivalWhere : LobbyFeeling full and unmistakeably giddy from his latest ' meal ' , Edward was pleased to return home to the large house . He stepped calmly into the main room , lips quirking upward at the corners as he glanced over the piano and walked at a completely human pace up to his room . His hand went to the door , turning the handle with ease , but , when he stepped through . He was n't in his house anymore . He stood completely still , the only moving part of him was his bright golden eyes searching his surroundings .
Question: Why does the main character seem perturbed ?
Options: 
A. None of the above choices .
B. He does n't want to leave the house .
C. He does n't know how to play piano .
D. His surroundings have changed .


D