Which of the Following Is Not a Problem with the Unilateral

Which of the following is not a problem with the unilateral imposition of sanctions?

A) Typically they are unsuccessful in producing the desired result.
B) Sanctions make it more difficult or expensive for the sanctioned country to obtain goods, yet the purported objective is almost never achieved.
C) The USA can apply diplomatic or commercial pressure to produce compliance by foreign countries and companies.
D) In order to work, sanctions need to be imposed multilaterally.