Need help with these questions:

Gains from trade are the:

A. increase in welfare in both countries that results from specialization and trade

B. transfer of surplus by the recovering country that results from trade

C. deadweight loss by the losing country that results from trade

D. increased skills and human capital that results from specialization and trade

The unemployment rate:

A. Is never zero

B. is measured by the number of people who are unemployed divided by the labor force

C. measures what percentage of our labor force is currently looking for a job and can't fine one

D. All of the are true

The aggregate demand curve:

A. shows the relationship between the overall price level and the level of total demand

B. shows the price level on the horizontal axis and output on the vertical axis

C. is upward-sloping, which is counter to the individual demand curve.

D. shows the relationship between the price of good and services and the level of total demand.