Astrophysicists MOST Often Detect High-Energy Cosmic Rays by

Multiple Choice

Astrophysicists MOST often detect high-energy cosmic rays by

A) positioning particle detectors in space.
B) observing showers of lower energy particles and photons generated when the primary cosmic ray interacts with matter in Earth's atmosphere.
C) observing their interactions with large tanks of material deep underground.
D) reflecting them at grazing incidence off custom-designed mirrors.