The Stability of

The stability of
C with respect to alpha,beta-plus and beta-minus decay is to be determined.The following atomic masses are known:
He: 4.002603 u
Be: 7.016928 u
B: 11.009305 u
C: 11.011433 u
N: 11.026742 u
The
C nucleus is

A) not subject to alpha,beta-plus or beta-minus decay.
B) subject to alpha decay only.
C) subject to beta-plus decay only.
D) subject to beta-minus decay only.
E) subject to beta-plus or beta-minus decay,but not to alpha decay.