Answer:
C. Empirical Evidence.
Step-by-step explanation:
When we look for information about health products, we need to be careful, because in the Internet there are too many fake news and reports about everything. So, following a fake post or article about health products can be really dangerous or even lethal.
Now, a company website is not a reliable source of information, because, as advertisements, their aim is to have traffic in their websites and to sell their products and magic solutions with their advertisements.
Moreover, these ads are not based on reliable information because in most of the cases they are not based on scientific facts.
Therefore, the best source of information in this context is C. Empirical Evidence, because that's the based of science, that's the best way to know if some product is actually safe and healthy.