Answer:
D
Explanation:
The television, printing press and newspaper were developed long before 1990s.
(C) For the longest time Europeans and other outsiders could not travel into central Africa due to the various disease they were not immune or accustomed to, as it meant almost certain death for anyone not native to the area.
It would be "party leadership" that is the most common party system in the world today, although it should be noted that there are still many unitary and dictatorship-based governments.