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The difference between the radii of $3^{\text {rd }}$ and $4^{\text {th }}$ orbits of $Li ^{2+}$ is $\Delta R _{1}$. The difference between the radii of $3^{\text {rd }}$ and $4^{\text {th }}$ orbits of $He ^{+}$ is $\Delta R _{2}$. Ratio $\Delta R _{1}: \Delta R _{2}$ is :

• A
  $8:3$
• B
  $3:2$
• C
  $3:8$
• ✓
  $2:3$