The graphs represents the box plot of the data, then it divides the data in fourths.
Since we have 6 data, the median must be the average
Since the only option where the median is in the number 6 is the third one then that is the correct answer.
But we can analyse more about the data, since
Then, the firs quartile must be at the second number, that is, the number 3, and the third quartile at the fifth number, that is, 9.