Which is the best example of a strong conclusion in a presentation?

A: Studies have shown that bottled water is not any safer than tap water in most communities. The FDA requires technicians to test all tap water before it is distributed.

B: Another argument against bottled water is the waste that is produced in making and disposing of the plastic bottles. Distributing cases of water creates pollution and traffic.

C: Drinking tap water instead of bottled water is a simple thing. It is inexpensive, saves the environment, and tastes great. Why buy bottles? Fill your glass at the tap and enjoy!

D: Do you think you can taste the difference between expensive bottled water and the water that comes from your tap? We took a poll of students here in our school. Here are the results.