Final answer:
Congo is not a parliamentary democracy among the given options, and Great Zimbabwe was the empire not located in West Africa.
Step-by-step explanation:
The country that is not a parliamentary democracy among the options is d. Congo. While Kenya, Nigeria, and South Africa have varying degrees of democratic practices, Congo does not operate under a parliamentary system. It's important to note that other countries in Africa like Angola, Botswana, and Madagascar also do not have parliamentary democracies.
Regarding the empires that were not in West Africa, the correct answer is a. Great Zimbabwe. Great Zimbabwe was an empire located in Southern Africa, as opposed to the other options, Ghana, Mali, and Songhay, which were indeed empires situated in West Africa.