this part of the essay is clearly adding support ideas to the thesis statement, which is not present but can be enferred from the supporting ideas.
All of the sentences are overtly supporting the same idea, "conserving water saves money", but the stronger expressions are these:
Another reason for conserving water is to save money.
demand will drive prices higher and higher.
will save you money in the long run.
So the final answer is:
A. Support
