Which command will be used to display a file within the specified directory of pathname?

The correct answer is A. Dir \pathname.

The Dir command is used to display the contents of a directory. The syntax for the Dir command is:

Dir [drive:][path] [filename]

In this case, we are only interested in displaying the contents of the directory specified by the pathname. So, the correct command is:

Dir \pathname

Option B is incorrect because it includes an extra pathname. Option C is incorrect because it includes a / character, which is not valid in a directory name. Option D is incorrect because it includes a filename.