How Should You Approach Materials Presented on the Internet by Professional

How should you approach materials presented on the Internet by professional advocacy groups?

A) Advocacy groups usually present only one side of an argument, and may be biased even if they contain useful information for one side of the argument.
B) They are best for information about legal items, but don't necessarily include accurate health or disease-related information.
C) If they're professional groups, then they are more reliable.
D) Advocacy groups tend to publish propaganda, and are known for distributing intentionally misleading information about their causes.