Which of the Following Statements About Majority-Minority Districts Is LEAST

Which of the following statements about majority-minority districts is LEAST accurate?

A) They represent attempts to enhance political participation and representation of minorities.
B) They redraw district lines so as to enhance the political power of racial groups.
C) Their efficacy has been questioned, as they lead to other districts being more fully dominated by whites.
D) The Supreme Court has declared redistricting solely on the basis of race to be an unconstitutional practice.
E) Evidence suggests that majority-minority districts contribute to significant declines in white political participation without any visible increase in minority participation.