But it arguably takes more data to encode an A - three lines, which means six endpoints, plus whatever signifies the command "draw a straight line." At minimum, that's seven pieces of data.

A C, however, can be drawn as half of a circle - one command to draw an arc, a center point, a radius, and the start and stop angles. Five pieces of data.

(This is assuming, of course, that computers prefer minimal amounts of data. If that's wrong, then the computer would obviously prefer B. You need more data to describe it.)