The Main Source of Cosmic Rays,the High-Energy Atomic Nuclei That

The main source of cosmic rays,the high-energy atomic nuclei that strike Earth's atmosphere from interstellar space,is believed to be:

A) rotating, magnetized neutron stars.
B) matter from accretion disks surrounding neutron stars and black holes.
C) acceleration of nuclei by neutrinos during supernova explosions.
D) supernova debris colliding with interstellar material.