Which sentence from “Trip to Mars Could Damage Astronauts’ Brains” best supports the answer to Part A? A. Particles zipping through space could be the wrong stuff for Mars astronauts. B. The study's authors now worry that astronauts could suffer similar effects on long missions outside Earth's protective atmosphere. C. "We weren't expecting such dramatic effects from these charged particles," says Limoli. D. Learning more about cosmic rays may help scientists create better ways to protect those astronauts.