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 .

OPTIONS:
[1]. Because the surgery was expensive .;
[2]. Because the surgery was botched .;
[3]. None of the above choices .;
[4]. Because he feels useless .;
Answer the following question: Why is the narrator frustrated ?
[4].