Read the excerpt from A Black Hole Is NOT a Hole by Carolyn Cinami DeCristofano.

Einstein's idea of gravity had big consequences. It helped explain some observations that Newton's idea didn't account for. It also opened our minds to amazing new possibilities. For example, taking his cue from Einstein's idea that space bends, scientist Karl Schwarzschild began to think about what would happen if a place in space were extremely distorted. His light would follow the hyper-bent space, never to turn away from it. This was the first prediction of a black hole. At first, some scientists (including Einstein!) rejected Schwarzschild's ideas. Others were intrigued and began searching the skies for real black holes. Just decades later, they found the first of them. It just goes to show: sometimes, as Einstein himself once said, "Imagination is more important than knowledge."

According to the excerpt, how does Karl Schwarzschild use Einstein’s ideas to draw a conclusion?

Karl Schwarzschild uses Einstein’s ideas about gravity to conclude that Newton’s ideas had faults.
Karl Schwarzschild uses Einstein’s ideas about gravity to conclude that space bends.
Karl Schwarzschild uses Einstein’s ideas about space bending to conclude that black holes are possible.
Karl Schwarzschild uses Einstein’s ideas about imagination to conclude that it is more important than knowledge.