Which of these is an example of a variable expense calculated in an organizational budget?

In an organizational budget, variable expenses are the total cost that depended on the amount of goods produced.
Example of variable expenses are:
- Raw material expenses
- Cost of plastic to make a handphone case
- Cost of carrots if the company is selling carrot pies
- etc

He wanted for people to start being more green.

By doing things like using electric cars, using energy efficient lightbulbs, etc.