Read the following context and choose the best option to answer the question.
Context: Wow , Watching my wife recover from Surgery is a real lesson . I knew it was hard for her when I was in recovery from the Hip replacement , but I had no idea how frustrating it really can be . All I want to do is help but there is really nothing I can do .
Question: Why is the narrator frustrated ?
Options: 
A. Because the surgery was expensive .
B. Because the surgery was botched .
C. None of the above choices .
D. Because he feels useless .


D