The answer is B. "Estudiante" is not correct because it is the singular form for student, while the rest of the sentence is in plural. The correct form of the sentence is "Las estudiantes son inteligentes".
In the 19th century, the poor represented a threat to the social order, so the government created laws to regulate them and provide them with some kind of care, but the administration and social work was carried out mostly by citizens who organized themselves to bring social aid to the poor and more disadvantaged, as well as creating shelters for poor people, attending them with education, health and legal assistance, this was how the movement was adding more volunteers to social activism to help their neighborhoods with the rescue of people from prostitución, diseases or any extreme situation they were dealing with.
They wanted more power for state governments.
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