The letters A, B, and C are fine and dandy, but Letter D is dominant over all. It has the curve of the letter C but deviates into its own; at the same time, it doesn't need two curves like the letter B. The letter A has no curves at all, so it can not compete.
The letter D can fill lots of roles from deadly to dull, dumb to delicious. You can say just about anything with the letter D. Choose D, and you will define your domain.