The correct option is A Frappuccino
An outlier is a value in a data set that is either too small or too big compared to the other values of the same data set.
Arranging the cost of each type of coffee into an ordered data set, we get:
3.6, 4, 4.5, 6, 14
From this, we can see that $14 is too large compared to the other values.
Thus, Frappuccino is the outlier.