To find the square root of 78, you can use a calculator. The calculation gives:
\[ \sqrt{78} \approx 8.83176 \]
Now, without specific choices shown in your question, I can't provide a direct answer regarding which choice is correct. However, if you have options based on the approximate value of 8.83, you should be looking for a choice that is closest to this number.
If you provide the specific choices, I can help identify the correct one.