Ang mga hadlang sa kalakalan ay mga paghihigpit na sapilitan ng pamahalaan sa internasyonal na kalakal, na karaniwang binabawas ang pangkalahatang kahusayan sa ekonomiya.
B, if you do all of the work it equals b
Option A would be disruptive. Option B may would likely not help and may also be disruptive. Option D would likely not work because he can't get through not understanding. The answer would be Option C.
