You'd use A just because it has hiroshimas isn't it

without much thinking: 15/12/15/19

A looks quite close to a Dragon0, but with horizontal hiroshimas instead of actual moves. Costed like Dragon0. 14 or 15.

B feels like Chastity+, like you said, but more dangerous depends on how you use it. In the worse case it may even be a super-safe pin on the enemy's home rank. Costed as Chastity+ + 4. (Honestly idk)

C and D reaches another level of potential brokenness, namely the 3-leaper unblockable + the horizontal unblockable movement. Beacon + C or Summoner/Portal + D can make a potential paladin-proof 2-turn check(mate).

Putting that aside, C and D looks like 2 different ways to make a weird ninja + weird paladin. However, the long back swap in D may cause even more trouble comboing with eg B or promoting minions, along with the generally safe attack range, will be ranked higher. C would be around 14-16 and D would be around 18-21.

Overall BCD is harder to estimate because it has a potentially gamebreaking setup but I don't know how hard it is to counter them (given how i'm just a player with rating above 3), and A is just HiroshimaDragon. Like Dragon but with udon on top of it.