Answer: The answer is 4.1
The answer you are looking for is D
An author's credentials can determine a health source's credibility. None of the other options would apply to credibility. When it comes to health, if you want to make sure that what you are researching or reading is authentic and reliable you need to find out whether the author is a professional health expert or not. You can do this by finding out their credentials.
C: More children are being born worldwide
Answer:
Peer relationships are most know to negatively affect social health when the groups being formed are involved in risky or harmful behavior.
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Hope this helps you! :)