about first option:)
I don't think Mexico would agree to accept the US' addicts, so the US would be unsuccessful in the first option.
second option: )
decriminalized most drugs produced in Mexico to discourage drug dealers from selling in the United States
- this would actually be probably very efficient, as we know from the experience of some other countries, such as Portugal, but it's not true.
increased
security along the coasts and border areas with Mexico to try to stop
the entry of illegal drugs
-this is the correct answer, although it might not be the most effivient
about the forth options: )
reduced trade with Mexico in most industries
as a punishment for failing to stop the illegal drug trade: no, this would not be good for either of the parties.