All these but one were not created in Abacha's region

Three out of the four options listed were not created in Abacha's region. Ebonyi, Gombe, and Ekiti were created in 1996 during the military administration of General Sani Abacha. These three states were carved out of existing states, namely Abia, Bauchi, and Ondo States, respectively. On the other hand, Katsina State was not created during Abacha's administration. Katsina State was created on September 23, 1987, during the military regime of General Ibrahim Babangida. It was one of the states created to bring the total number of states in Nigeria to 21. Therefore, the only option that was not created in Abacha's region is Katsina State.