To identify which of the options is a rational number between 5 and \(5 \frac{1}{4}\) (which is \(5.25\)), we can convert these options to decimal form and check if they fall within the range.
- \( \sqrt{26} \) is approximately \( 5.099 \); this is between 5 and 5.25.
- \( \frac{51}{8} = 6.375 \); this is not between 5 and 5.25.
- \( \frac{52}{5} = 10.4 \); this is not between 5 and 5.25.
- \( \frac{51}{3} = 17 \); this is not between 5 and 5.25.
The only rational number from the given options that lies between 5 and \(5 \frac{1}{4}\) is \( \sqrt{26} \).