You eat dinner every day. This can be considered to be a process. The average number of calories you consume with dinner averages $805,$ but the number of calories varies each day. Which of the following is an example of a source of special cause variation?

The amount of oil or fat you use preparing dinner varies daily.

A holiday feast, such as Thanksgiving dinner

You occasionally choose to eat dessert.

None of these options. Well, except this one, of course. This one only.