Natural radioactivity consists of the emission of
-
A.
( alpha ) -particle and ( beta ) rays -
B.
( alpha ) -particle and X-rays -
C.
( gamma )-rays and X-rays -
D.
( alpha )-particle, ( beta ) rays and ( gamma )-rays -
E.
( alpha ) -particle, ( beta ) rays, ( gamma )-rays and X-rays