Write the next sentence in this paragraph:

How to find mean, median, and mode
Add up all of the numbers in the set.
Let's say you're working with the numbers 2 , 3, and 4. Add them up : 2 + 3 + 4 = 9.

Available choices:
a). To find mean, go back to your set from the variables list (at the top of the row) and the numbers 2 + 4. A good way to do this is to find the first number and then add 2 + 3, which is this number multiplied by 1.;
b). The number 4 multiplied by 4 , 2 divided by 4 equals 9. Repeat this step for each number in the set.;
c). It's a very simple thing to do. The set isn't nearly as complex as it sounds.;
d). Count up the amount of numbers in the set. In this case, you're working with 3 numbers.;
d).