To solve this question, the user needs to be familiar with the concept of creating dialog boxes and specifically, the font dialog box.

Now, let's go through each option and explain why it is right or wrong:

A. Font: This option is incorrect because the name "Font" does not indicate that it is specifically used for creating a font dialog box. It may refer to a class related to font manipulation, but not to the creation of a font dialog box.

B. FontBox: This option is incorrect because, similar to option A, the name "FontBox" does not specifically indicate that it is used to create a font dialog box. It may refer to a class related to font manipulation, but not to the creation of a font dialog box.

C. FontDialog: This option is correct. The name "FontDialog" specifically indicates that this class is used to create a font dialog box. It is a common naming convention in programming to use descriptive names for classes, and in this case, "FontDialog" accurately describes the purpose of the class.

D. FontDisplay: This option is incorrect because the name "FontDisplay" does not specifically indicate that it is used to create a font dialog box. It may refer to a class related to font display, but not to the creation of a font dialog box.

E. FontDialogBox: This option is incorrect because the name "FontDialogBox" is not a standard naming convention for the class used to create a font dialog box. The commonly used name is "FontDialog".

Therefore, the correct answer is:

C. FontDialog.