Identify the true statement. Choose one: A. The center material of our Solar System's protoplanetary disk developed into the Sun, while the series of surrounding dust, gas, and ice rings became planets. B. Volatile materials are those that melt only at high temperatures. C. Planetesimals that were larger than 1 km in diameter gravitationally pulled in all surrounding dust, ice, and smaller planetesimals to become asteroids. D. A stellar wind consists of the debris that is exploded out of a star as it "dies."