The emission spectrum of hydrogen is found to satisfy the expression for the energy change $\Delta E$ (in joules) such that $\Delta E = 2.18 \times 10^{-18} \left( \frac{1}{n_1^2} - \frac{1}{n_2^2} \right) \, J$ where $n_1 = 1, 2, 3 \dots$ and $n_2 = 2, 3, 4 \dots$. The spectral lines correspond to the Paschen series when:

• A
  $n_1 = 1$ and $n_2 = 2, 3, 4$
• B
  $n_1 = 3$ and $n_2 = 4, 5, 6$
• C
  $n_1 = 1$ and $n_2 = 3, 4, 5$
• D
  $n_1 = 2$ and $n_2 = 3, 4, 5$