<h2>
Answer:</h2>
Option: D is the correct answer.
                  D.  (2,54)
<h2>
Step-by-step explanation:</h2>
We know that an outlier of a data set is the value that stands out of the rest of the data point i.e. either it is a too high value or a too low value as compared to other data points.
Here  we are given a set of data points as:
          (2,54)
           (4,7)
          (6, 9)
          (8,12)
          (10,15)
Hence, we see that the output values i.e. 7 in (4,7) ; 9 in (6,9) ; 12 in (8,12) and 15 in (10,15) are closely related.
Hence, the data point that is an outlier is:
                   (2,54)
 (As 54 is a much high value as compared to other)