To solve the inequality \( \sqrt{2n} < 5 \), we first square both sides to eliminate the square root (noting that both sides are positive since we are dealing with a square root). This leads to:
\[ 2n < 25 \]
Now, divide both sides by 2:
\[ n < \frac{25}{2} \]
Thus:
\[ n < 12.5 \]
This means that any value of \( n \) that is less than \( 12.5 \) will satisfy the inequality \( \sqrt{2n} < 5 \). So if you have specific options for \( n \), choose the one that is less than \( 12.5 \).