Which of the following is not a sign of bias in a website?
a. membership in a special interest group
b. endorsement of political or religious groups
c. one viewpoint delivered in depth
d. alternative viewpoints presented and addressed objectively

Possessing a membership in a special interest group opens one up to favoring that groups and disfavoring things at odds with that group. This also applies to political or religious groups, as these can be sorts of special interest. Delivering one view point in depth can also be a sign of bias, but providing several alternative viewpoints and addressing them objectively is not. By providing multiple viewpoints, you can disentangle any favoritism from any given analysis. The answer is therefore d) alternative viewpoints presented and addressed objectively.