Which evidence from "Healing a Wounded Heart: Daniel Hale Williams" best supports the idea that Williams improved health care for black Americans?

"When Dr. Williams set up his medical practice, there were only three other black doctors in Chicago."

"He also provided medical care for children at a nearby orphanage and taught anatomy at the medical college where he had studied."

"And as a surgeon, he was bold enough to take risks but careful enough to ensure the safety of his patients."

"In fact, Provident was the first hospital in the United States in which black and white doctors worked together to care for all patients, regardless of race."