what is the purpose of trading blocs?\na. to restrict trade between member nations\nb. to encourage free…

Brief Explanations:

Trading blocs are groups of countries that come together to promote economic cooperation. Their main goal is to reduce trade barriers (like tariffs) among member countries. Option A is incorrect as trading blocs aim to facilitate, not restrict, trade among members. Option C is wrong because currency exchange is a normal part of international trade and trading blocs don't prevent it. Option D is incorrect since trading blocs typically work to lower, not increase, tariffs. Option B aligns with the purpose of trading blocs as they encourage free trade among member countries through measures like preferential trade agreements.

Answer:

B. To encourage free trade among member countries