In the equation ${ }_{13}^{27} Al + { }_2^4 He \longrightarrow { }_{15}^{30} P + X$,the correct symbol for $X$ is:

• A
  ${ }_{-1}^0 e$
• B
  ${ }_1^1 H$
• C
  ${ }_2^4 He$
• D
  ${ }_0^1 n$