单选题 . ①Abolitionist Frederick Douglass' move to Rochester, New York, in 1847 was a major step in his finding his own intellectual path. ②Along with much of the rest of western New York, Rochester became fertile ground for an antislavery movement that dissented from that led by William Lloyd Garrison, with whom Douglass had previously been aligned. ③Unlike the Garrisonians, who believed the Union established by the United States Constitution must be dissolved in order to abolish slavery, many Rochester activists began to see both the Constitution and the political process as invaluable instruments for achieving that goal. ④During the 1840s and 1850s, many abolitionists had become frustrated by the failure of Garrison's method of moral persuasion. ⑤They turned instead to politics to fight slavery.19. Which of the following statements best describes the function of the highlighted sentence? ______

A、 It emphasizes Garrison's popularity among abolitionists prior to the 1840s.
B、 It points out a similarity between Garrison's position and that of Douglass prior to the latter's move to Rochester.
C、 It illustrates the extent to which Garrison disdained politics as a tool to achieve abolition.
D、 It explains the motivation behind the Rochester abolitionists' split with Garrison.
E、 It suggests that the previous alliance between Douglass and Garrison has been overemphasized.

【正确答案】 D

【答案解析】 D：本题属于功能题，定位句3s版本是“加里森失败了”，而这又是罗切斯特和加里森分开的原因，因此选项D正确。