How did emperor asoka's achievements reflect the ideals of buddhism?

The correct answer to this open question is the following.

Emperor Asoka's achievements reflected the ideals of Buddhism in the following ways.

As the third ruler of the Mauryan Empire, Ashoka the Great (304-232 BCE) ruled India under the principles of Buddhism with much success. In the beginning, he was a cruel ruler and his army killed many people. But after so much blood and a time of introspection, Ashoka changed and followed the principles taught by Buddha. History says that he wrote an edict in which he expressed his regret for what he had done in the past. So Ashoka made a reformation to instill peace in his reign and his officials carved rock with his edict for the people to contemplate it. He promoted freedom of religion and tolerance of different beliefs. He constructed hospitals and helped the poor. He ordered to plant fruit trees, and promote the respect for the elderly.

the answer is b, encourage free trade

can you explain it better