In a radioactive series
( ^{235} _{92}L to ^{235} _{92}M to ^{231} _{90}N to ^{231} _{91}phi )
The particles emitted are respectively
-
A.
( beta , beta , alpha ) -
B.
( alpha , gamma , beta ) -
C.
( gamma , alpha , beta ) -
D.
( alpha , alpha , beta ) -
E.
( beta , alpha , beta )