Which description refers to a high-definition monitor that supports 1080p?

A.
Every horizontal inch consists of 1080 pixels.

B.
The image on the screen consists of 1080 pixels.

C.
The screen resolution is 1080 pixels in height.

D.
The screen resolution is 1080 pixels in width.

Explanation:

http://peripherals.about.com/od/monitorsdisplayscreens/a/whatsHD.htm