Answer:
The source which is the most credible for research about animal rights, specifically the treatment of lab animals is:
a segment from a weekly television news show.
Step-by-step explanation:
When we analyze each of the options, we realize three of them have reasons to be biased. The first option is the blog. Of course, if it is written by an animal-rights activist, we can imagine it will strongly advocate against labs as well as other companies. The fact that it is written anonymously, in this case, is concerning. It is more difficult to know if the person writing is serious about the cause since we cannot determine who it is.
The second and the last options concern businesses that perform animal testing. Again, we would have reasons to doubt their claims, since it is in their interest that people see them as the good guys. They may hide information about their practices because they fear public reaction.
The best option for a credible source is the third one. The segment from a weekly television news show is more likely to investigate and interview thoroughly. This type of program has to avoid bias or conclusions unless the fact they are disclosing is too blatant. It also makes an effort to listen to different sides of the same story.