Which of these is the best source of information about a health product ? a. company claims b. celebrity doctors c. paid endorsers d. scientific research

The best answer would be D, Scientific Research. 

Company claims are usually nothing more than a way to get consumers to purchase the product. Celebrity Doctors tend to not be the most reliable source and will do anything to earn a little extra income. Even if that means lying to the public and telling them something works. Paid Endorsers are a no as well. They're getting paid to talk about it. This goes back to the Celebrity Doctor issue. 

Answer (6) six inches of the floor;