Which statement below is an accurate description of the role of the military in Mexico and Nigeria in the past 50 years?
A. In both systems, the military has often governed in lieu of civilian governments.
B. In both systems, the military is torn by ethnic dissension, making the military very instable.
C. In both systems, the oil industry is in the hands of the military.
D. In Mexico, the military has played a minor role in governing, while in Nigeria it has been actively involved.
E. In Mexico, the military has ethnic minorities in it; in Nigeria, the military has been dominated by Islamists.