The text has some concerns about truth or proof, at least as they are employed in the world of evidence-based decision making. What are these concerns?

	a.	Only a very few studies are of sufficient quality and rigor to establish truth in a general manner.
	b.	The practice of evidence-based decision making is the only way to establish proof. Other methods do not meet basic deductive reasoning requirements.
	c.	Given the complexities of most decisions and the probabilistic nature of the world, finding universal truths is impractical (if not impossible).
	d.	Given the nature of how we perceive reality, there can be no such thing as a truth.