The answer is C) They are different Tribes
In the book, the man and the woman belong to Ibo and Ibibo groups which are two distinct tribes that live in the modern country of Nigeria.
These tribes are found in and around the city of Lagos.
Both groups exhibit slightly different customs and traditions and in the book, a whole story is based around this.
The Ibo are mostly rural tribes who follow old tribal customs and discourage love marriages. Parents in the community usually arrange marriages within the tribe and the children do not have a say.
The Ibibo community however, is more modern and not bound by old traditions.
The book is on the turmoil and confusion that love can create when in between two very distinct African tribes.
The October Revolution would not have taken place without the prior experience of the Russian revolution of 1905.
I don't know your options, but here is a list of some of the things that they preyed upon:
-antisemitism and racism, fear of foreigners and of others: Antisemitism and the other related ideas were already present in the society, but they used it to their advantage - they blamed the others
-weak economy - before their rise to power, there was en economic crisis and such crises make people more vulnerable to propaganda