A secondary source is reliable and credible if the person who created the source is an expert on the topic, is educated and respected in the field of study, and:

Ais published on the Internet.
Bdoes not have anything negative to say about the topic.
Cis not influenced by a bias.
Dwas living at the time of the subject matter
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The answer would be option C. A secondary source is reliable and credible if the person who created the source is an expert on the topic, is educated and respected in the field of study, and is not influenced by a bias.

Explanation:

A is not the right answer because nowadays, any person who has an internet-capable divice and wifi connection can have their ideas published online. Option B is not the answer because research should strive to be biased, not necessarily abstain from saying negative things about the topic. Option D is not the answer because a person living at the time of the subject is not necessarily relevant when it comes to researching it.

C is the right answer because a trusted research may have an opinion but has to take on the topic and evaluation without being influenced with biases, that means, without being influenced with prejudice in favor of or against one thing.