What was the grimke sisters' argument for equal rights for women based on?

The moral nature of human beings is the correct answer.

Hope that cleared the confusion. Good luck!

- "bill clinton ( the 42nd u.s. president, served in office from by low unemployment, declining crime rates and a budget surplus. during clinton's second term, the u.s. economy was healthy, unemployment was low and the nation experienced a major technology boom and the rise of the internet."