Answer:
C. Citizens in lands controlled by foreign powers began to demand
their independence.
What is Nationalism?
The policy or doctrine of asserting the interests of one's own nation viewed as separate from the interests of other nations or the common interests of all nations.
One of the elements that developed during the Second World War was this. Therefore, we can say that as nationalism among many groups grew, citizens of countries under the authority of foreign powers started to demand their freedom.