Trade adjustment assistance:
a. worker dislocated by international trade without erecting barriers that impede foreign trade.
b. subsidizes new firms trying to compete in international markets.
c. protects domestic jobs by reducing imports.
d. establishes a series of gradually loosened import quotas so that domestic firms have time to improve their international competitiveness or transition to new markets.

a.  helps worker dislocated by international trade without erecting barriers that impede foreign trade.  

Explanation:

Trade Adjustment Assistance -

It is a federal program of the government of the U.S.  , in order to reduce the damaging impact of imports that are felt by the sectors of the U.S. economy .

There are four company currently , i.e. , for the firms , farmers , workers and the communities .

The workers program is the largest of all , and is administered by the U.S. Department of labor ,  

It also helps to dislocate by the international trade without the erection of the barriers of the impede foreign trade .

and the communities by the U.S. Department of Commerce .

i would say iii (3) because in order to compare a price you have to use as a reference other near stores because it's its

hope i explained myself