?The pages on a university's website are maintained by individual departments and organizational units. It is a useful policy to require that every change a user makes to his department pages be reviewed and approved.  

To help human readers understand why a method's statements are there, good programmers insert explanatory ____ into their methods.

A. behaviors B. actions C. comments D. conditions

____ are useful when you want to arrange text and images in order to make the information straightforward and clear to the Web page visitor.

Fill in the blank(s) with the appropriate word(s).