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

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.
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.
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!
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.