Based on the passage, it can be inferred that Elizabeth Cady Stanton's ability to write and speak helped get the movement's message heard by the public. The passage highlights Stanton's verbal brilliance and her skill in expressing the ideas of the movement, which suggests that her personal qualities significantly contributed to the communication and promotion of the women's suffrage movement. Therefore, the most accurate response is:
Her ability to write and speak helped get the movement's message heard by the public.