There is only one Rock Edict in which Asoka talks about

There is only one Rock Edict in which Asoka talks about taxation. Which among the following is that edict?

[A] Bhabru Inscription
[B] Nigalisagar Pillar Inscription
[C] Rummindei Pillar Inscription
[D] Barabar Cave Inscription

This question is part of UPSC Prelims Practice and Mock Tests membership programme.