Answer:
Here we need to link the country with the habit.
En república Dominicana es muy educado.
We need to find something that is very polite to do in the Dominican Republic, for example, bringing modest clothes to the church (Option B, llevar ropa modesta a la Iglesia)
En Puerto Rico es educado:
Here we need to find something that is polite to do in Puerto Rico, here the right option is "Bringing elegant clothes to a party" (option D)
En Argentina es maleducado:
Here we need to find something that is not polite to do in Argentine, here the right answer is "arrive late to a party" (option C, llegar tarde a una fiesta)
En Costa Rica es muy común:
The remaining option is "eat in the train" (option A, comer en el metro) which is also a common thing to do.
