The theory of comparative advantage states that:

a. productivity rises more quickly when countries produce goods and services for which they have a natural talent.

b. productivity decreases when countries produce goods and services based on their natural resources.

c. all countries start out on an equal playing field.

d. countries that operate under a policy of isolationism have a comparative advantage

Kevin and jenny, who are both working full-time, have three children all under the age of ten. the two youngest children, who are three and five years old, attended eastside pre-school for a total cost of $3,000. ervin, who is nine, attended big kid daycare after school at a cost of $2,000. jenny has earned income of $15,000 and kevin earns $14,000. what amount of childcare expenses should be used to determine the child and dependent care credit?