Acountry that currently does not trade with other countries could benefit by

restricting imports and promoting exports.
promoting imports and restricting exports.
restricting both imports and exports.
not restricting trade.

Surely if said country was looking to begin trade with other countries then they would most benefit by having no trade restrictions. They could apply restrictions later if a complication arises (such as drugs, weapons or other nasties), however from my understanding if a restriction was placed on imported goods then it could result in the trade partner in turn restricting imports from the country in question. Sure they could promote their own exports more, however if they are more prepared to receive than to give then potential trade partners might not be so keen. Dunno if this helps, just my two cents really 

The answer is c) it has a lower cost to attend 

If a huge trend is in place and a company does not take part in it or speak about it they might be criticized for their lack of corporate  social responsibility.  hope this you!