Efforts to Draw Boundaries to Promote the Election of Minorities

Efforts to draw boundaries to promote the election of minorities

A) have been equally effective for blacks as for Hispanics.
B) have been more effective for Hispanics than for blacks.
C) have been more effective for blacks than for Hispanics.
D) were more effective for blacks in the 1980s, but more effective for Hispanics in the 1990s.
E) have been equally ineffective for blacks as for Hispanics.