Cancer may arise as a result of
spontaneous mutations.
A) mutations associated with chemical mutagens.
B) mutations associated with radiation.
C) mutations associated with viral infection.
D) All of these

Question

Cancer may arise as a result of 
  spontaneous mutations.  
A) mutations associated with chemical mutagens.  
B) mutations associated with radiation.  
C) mutations associated with viral infection.  
D) All of these

anonymous · Answer

All of these. I assume you couldn't care less about an explanation so i spare you the details.

anonymous · Answer

its true exuras, most people dont care for an explanation
some of these questions are unbelievable