Which of the Following Statements About Events During the Fourth

Which of the following statements about events during the Fourth Republic is TRUE?

A) Its first president, Olusegun Obasjano, undertook a number of steps towards democratization, such as retiring military officers who held power under military governments, while he simultaneously sought to use nondemocratic means to sustain his stay in power.
B) Its first president, Olusegun Obasjano, promised an anticorruption campaign but failed to deliver on this.
C) Its second president, Umaru Musa Yar'Adua, was largely ineffective due to failing health and political challenges.
D) The military has not intervened in politics but has threatened to do so.
E) All of the above statements are true.