The correct answers are:
-William Lloyd Garrison: Abolition
William Lloyd Garrison was a prominent American abolitionist, journalist and social reformer. He is best known for being the editor of the radical abolitionist newspaper The Liberator, and as one of the founders of the American Anti-Slavery Society.
-Horace Mann: Education
Horace Mann was an American educator and politician, recognized as an education reformer in the United States. He was included in the first list of Americans belonging to the Hall of Fame for Great Americans.
-Dorothea Dix: Treatment of the mentally ill
Dorothea Dix was an American activist who vigorously campaigned and pressured the US Congress to create the first mental asylum in the country.