Answer:
C. the GDP rate
Step-by-step explanation:
Family size depends on how many members cohesive in a parental nucleus. This depends directly on the number of children, marriages, the social values that add up to a family nucleus and the divorce rate (since divorce decreases the number of people living together). However, the GDP rate does not directly affect the size of a family, although it has an indirect influence. When the economy is fine, people can choose to have more children, but this is an external variable that affects indirectly, unlike the other alternatives.