Which nuclear reaction is not balanced?

• A

  ${ }_5^{10}\mathrm{B}{+}_2^4\mathrm{He}{⟶}_7^{13}\mathrm{N}{+}_0^1\mathrm{n}$

• B

  ${ }_{92}^{238}\mathrm{U}{+}_2^4\mathrm{He}{⟶}_{95}^{241}\mathrm{Am}{+}_0^1\mathrm{n}$

• C

  ${ }_{18}^{40}\mathrm{Ar}{+}_1^1\mathrm{H}{⟶}_{19}^{40}\mathrm{K}{+}_0^1\mathrm{n}$

• D

  ${ }_7^{14}\mathrm{N}{+}_2^4\mathrm{He}{⟶}_8^{17}\mathrm{O}{+}_1^1\mathrm{H}$