Ionisation energy of $He^{+}$ is $19.6 \times 10^{–18}\; J \;atom^{–1}.$ The energy of the first stationary state $(n = 1)$ of $Li^{2+}$ is

Question

( A ) $8.82 \times 10^{–17}\; J atom^{–1}$
( B ) $-4.41 \times 10^{–17}\; J atom^{–1}$
( C ) $4.41 \times 10^{–16}\; J atom^{–1}$
( D ) $2.2 \times 10^{–15}\; J atom^{–1}$