Start by naming any country that France borders. Then name any country that borders any of those countries. Then keep going until there are no more countries left to name.
There were actually two other circuits in Africa. You have Ain-Diab, Kyalami, and Prince George Circuit which was located in East London, South Africa.
Nice quiz! Could you accept just chequered for the c question, instead of needing chequered flag, maybe? It would be faster and the word flag is already in the question, so it would make more sense grammatically.