(A) : Radiation that is given off by nuclear waste is extremely damaging to biological organisms.
(R) : It causes mutuations to occur at a very high rate.
A. If both (A) and (R) are true but (R) is not the correct explanation of (A).
B. If both (A) and (R) are true and (R) is the correct explanation of (A).
C. If (A) is true but (R) is false.
D. If both (A) and (R) are false.