Angola, Liberia, and Cameroon are all countries located on the western coast of Africa, bordering the Atlantic Ocean. Kenya is located on the eastern coast of Africa, bordering the Indian Ocean. Although all four are coastal countries, the question might be implicitly distinguishing based on the coastline or contain an error, given that all listed countries are indeed coastal. However, if forced to choose which is "not a country of the coast of Africa" in a set where others share a common feature (like the Atlantic coast), Kenya, being on the Indian Ocean coast, is the outlier. Note that factually, Kenya is a country on the coast of Africa. This question might be poorly phrased or contain an error. Assuming the intended answer is based on geographical distinction between west and east coasts among the options, Kenya is on the east coast while the others are on the west.