To solve this question, the user needs to know how to close a directory handle in a programming language.

The correct option to close a directory handle in a programming language is closedir EVAN;.

Option A close EVAN; is incorrect because close is used to close a file handle, not a directory handle.

Option C close_directory EVAN; is incorrect because there is no such function or command in most programming languages.

Option D none of the above is incorrect because option B closedir EVAN; is the correct command to close a directory handle in most programming languages.

Therefore, the answer is: B. closedir EVAN;