The correct answer is A. The United States' refusal to lift the trade embargo, despite calls for its end.
Step-by-step explanation
The cartoon shown in the question shows the island of Cuba surrounded by the arms of a character wearing a hat that represents the United States, one of his arms says "embargo". Behind the character is a boat representing the United Nations accompanied by a text box that says "Lift the embargo, lift the embargo!" This cartoon represents the embargo that the United States had against Cuba for a long time. According to the cartoon, it can be interpreted that the United States did not intend to withdraw the embargo on Cuba despite the calls made to withdraw it. An example of this is that the drawing refers to the United Nations as a supranational organization to request the United States to lift the embargo. Therefore, the correct answer is A. The United States' refusal to lift the trade embargo despite calls for its end.