The cartoon likely emphasizes the United States' opposition to European intervention in the Dominican Republic. Given the choices, the best response would be:
A. Europe was unwilling to comply.
This implies that the cartoon may be portraying Europe as defiant or resistant to US influence regarding the Dominican Republic.
However, if the cartoon depicts the United States actively opposed to this invasion in a way that suggests they are not taking an isolationist stance, it could also align with:
D. the United States was forcing the Dominican Republic to comply.
Ultimately, the correct interpretation depends on the specific imagery and message conveyed in the cartoon.