What happens next in this paragraph?

How to choose an hdtv
Measure the available area.
If you are putting an hdtv in an existing home theater cabinet, make sure you know the maximum size that will fit. Measure the tv enclosure diagonally, as this is how hdtvs are measured.
Possible answers:
(A). Most modern tv screens are 10 feet (1 meter) in length, compared to our television heads (4 meter). Next, determine the desired diameter of the hdtv enclosure.
(B). If you intend to buy one, buy a set that is low enough to you. If it isn't much larger, buy a 12 " square to determine the dimensions.
(C). For example, a 50 " hdtv is 50 " from corner to corner, but is less than that horizontally. Measure the distance from the couch to the tv.
(D). It could be an enclosed 2x4, or an enclosed covering. If you are putting an hdtv in an inside theater cabinet, make sure you know the maximum size of the enclosure.
(C).