The correct option is Dall the above
The african interior remained largely an accessed by European imperial powers because of a number of factors. these include the tropical sub Saharan diseases such as malaria, that had killed several early explorers. There was also fear of deadly and dangerous animals in the dark continent. In Kenya for example,early settlers had to contend with man eating lions. and the terrain was rough with less accessible rivers.
<span>Because Americans encouraged them to do so. The US wanted to build the Panama Canal, but Columbia, the country that controlled the region of Panama said no thanks. The US figured if Panama revolted against Columbia, and claimed their independence, then the US only would need Panama's consent. It was an American inspired revolution, because we wanted the Canal.</span>