Answer:
A. 15
Explanation:
The fundamental counting principle states if there is a outcomes/options and b outcomes/options, the total number of outcomes is a*b.
a * b
There are 3 sizes: small, medium and large
There are 5 flavors: strawberry, banana, orange, blueberry, and watermelon.
Therefore, we can say that a is 3 (sizes) and b is 5 (flavors).
3 * 5
15
Here is another way to think about it.
You can order a small smoothie five different ways, a medium five different ways, and a large five different ways.
5+5+5=15
Therefore, there are 15 total outcomes and A is correct.