Which source is likely to be the most unbiased?
a. immigration and america: a history by sarah stanley, phd. harvard university press, 2002.
b. good fences make good neighbors: why we must increase border security by ron riley. bass press, 2006.
c. "america's crisis" call-in talk radio show transcript. knnn. october 12, 2001.
d. libertdad! pamphlet produced by the center for immigrant rights, 2005.

The answer is A. B represents thoughts strongly for that of increased security therefore it is biased. Answer D is the same but for the opposing side. While answer C may seem like a good choice it is also wrong, is statistics that we be known as a convience sample and the reason it is biased and cannot be trusted is due to the fact that only those people with strong opinions will choose to voice that opinion.