Read the excerpt from Frederick Douglass’s speech on the emancipation of women. If the sense and sum of human goodness in man and woman combined is greater than in that of either alone and separate, then the government that excludes women from all participation in its creation, admiration, and perpetuation, maims itself, deprives itself of one-half of all that is wisest and best for its usefulness, success and perfection.

What is Douglass appealing to when he uses the phrase "deprives itself of one-half of all that is wisest and best for its usefulness”?

authority
credibility
emotions
evidence