With letter b is needed and i don’t understand

Which of the following groups of sentences most accurately describes the cuban missile crisis?

The early democratic-republican party believed that the united states

If the united states became a "majority-minority” nation, o whites would be the majority, but there would still be ethnic minorities. there would be an equal number of whites and ethnic minorities. othere would be more ethnic minorities in the population than whites. o no one would be considered white or part of an ethnic minority group.