first aof all try to put the statement more simple and in your words:
Goverment want to make lower the price of something avoinding the export of the same----> if we have a great supply of something, then the price of the same is low because the offer is greater than demand. So, we will have more something (nuts or whatever you want to figure out) to work with in our plants, so we have more men at work. However
in the end this will result in an higher unimployement rate sinceA
if we export less than before (as our statement says) we have less crops to plant, so in the end LESS
money. so a bunch of people will move from rural lands into the city trying to obtain a work.
The other options are completely irrilevant.
if you do this work one time with CR almost the time the answer come up as soon as you read the options. increasing your proficiency.
KUDOS is the good manner to help the entire community.