Which one of the following best expresses the main idea of the passage? A. Folk artists employed more principles of African oral tradition in their works than did Phillis Wheatley in her poetry. B. Although Phillis Wheatley had to overcome significant barriers in learning English, she mastered the literary conventions of eighteen-century English as well as African aesthetic canons. C. Phillis Wheatley's poetry did not fulfill the potential inherent in her experience but did represent a significant accomplishment. D. The evolution of a distinctive African American literary language can be traced from the creations of African American folk artists to the poetry of Phillis Wheatley. E. Phillis Wheatley joined with African American folk artists in preserving the principles of the African oral tradition.