The Stability Of ${ } _ { 6 } ^ { 11 } \mathrm { C }$

Multiple Choice

The stability of ${ } _ { 6 } ^ { 11 } \mathrm { C }$ with respect to alpha, beta-plus and beta-minus decay is to be determined.
The following atomic masses are known:
${ } _ { 2 } ^ { 4 } \mathrm { He } : \quad 4.002603 \mathrm { u }$
${ } _ { 4 } ^ { 7 } \mathrm { Be } : \quad 7.016928 \mathrm { u }$
${ } _ { 5 } ^ { 11 } \mathrm {~B} : \quad 11.009305 \mathrm { u }$
${ } _ { 6 } ^ { 11 } \mathrm { C } : \quad 11.011433 \mathrm { u }$
${ } _ { 7 } ^ { 11 } \mathrm {~N} : \quad 11.026742 \mathrm { u }$
The ${ } _ { 6 } ^ { 11 } \mathrm { C }$ nucleus is

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