Despite their many differences, the Hellenistic philosophers would have most agreed with the _?_ regarding duty because of the Greek's focus on fulfilling one's duties to reason and logic in order to achieve a sense of inner peace and tranquillity.
a. HIndu thinking in the UPANISHADS
b. Taoist thinking in the TAO TE CHING
c. Confucian thinking in the BOOK OF SONGS
d. Sumerian thinking in the EPIC OF GILGAMESH