Which major accomplishments were achieved by darius 1 of persia

certain institution  of a single language for a government

worcester v. georgia, legal case in which the u.s. supreme court on march 3, 1832, held (5–1) that the states did not have the right to impose regulations on native american land. andrew jackson refused to enforce the ruling, the decision form the basis for most subsequent indian law in the united states.

yup! you are correct it is b.