Answer:
-13
Step-by-step explanation:
The answer is A:
Because the only difference between the rest of the answer choices are the lower and upper quartiles, that is all you need to find. In order to do so you find the median for the first half (lower quartile) and then find the median for the second half. In this case it is 29 (Q1) and 58 (Q2)
We will use the followin property of logarithms:

So, we have

If you multiply both sides by 4, you get

It would be 8 because 3 less than 8.
Hope this helps! :D