No option in the question does it for me and as such i'd answer you as much as i can.
The correct question will be
In order to avoid the imposition of other types of trade barriers, foreign producers will sometimes agree to voluntary export restraints. With voluntary export restraints, foreign producers will ____________
Answer:
limit their exports to a country
Step-by-step explanation:
A voluntary export restraints is a restraint imposed/implemented by a government to control the exports of some type or category of goods to another country during a specified time frame.
This simply means that the voluntary export restraints is imposed by a government to ensure that the export of certain types of goods do not exceed a particular quantity or quota for a period of time.
It is usually done by a the exporting country to ensure that the importing country do not set some kind of trade barrier or restrictions.
Cheers.