It is certainly good for me physically, though I am a little ______ about its ultimate good.

A．as a result
B．otherwise
C．on the other hand
D．that is to say

A．Neville is a very bad boy
B．Neville should be sent to a nursery
C．she knows her son better than anybody else
D．a nurse should know more than any other people about how to look after a child