Which Statement About the Results of the Four Post-Apartheid Elections

Which statement about the results of the four post-apartheid elections is NOT correct?

A) ANC electoral support has been fairly stable.
B) The Democratic Party/Democratic Alliance's electoral support has grown substantially.
C) As measured by a percentage of registered voters, turnout declined after the first election but generally has been steady since, however, as measured as a percentage of the voting age population, turnout has steadily declined.
D) The proportion of the vote obtained by the opposition (parties other than the ANC) has been fairly steady, but its composition has changed.
E) Inkatha's electoral support has been fairly stable.