Apparently he 's home from the rehabilitation center and grumping around the house with his usual vigor . Did you know that ? I did n't . I stopped on the way home to visit Grandma and he came out from the kitchen . That 's how I found out . Everyone seemed in good spirits .
According to the above context, choose the best option to answer the following question.
Question: Why was he grumping around the house with his usual vigor ?
Options:
A. he was having a psychotic break again
B. he could n't believe it was me
C. he recovered fast and well from since his time in the rehabilitation center
D. None of the above choices .


C