Any spanish native speaker here? can you check this answer for me?

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Debo decidir qué carrera quiero estudiar. a. después de b. antes de c. para comenzar d. temprano

Originally, uruguay was home to small groups of indigenous tribes. during european colonization, nearly all the indigenous population was conquered, killed, or driven out. in what year did the spanish explorers first land in the area? 1492 1945 1600 1516

What was the important event between the united states and cuba in 1991? a.assigned clinics b.greater number of tourists c.seizure d.increased import and export flow