Answer:
the answer is D, having a sense of wellbeing.
Explanation:
Mental is in your head not physical, so it's not B or C. Getting along with others is more of a component of being a good friend but not necessarily helps someone's mental health.
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Failure to thrive=infants that do not develop normally, or are unable to eat/drink/sleep/breathe properly.
SIDS=Sudden Infant Death Syndrome
The steps to managing one's emotions are to recognize, accept, and control. It is important to recognize if you are sad, jealous, happy, or angry. Then It's important to accept that your feelings are valid and accept how you feel. Finally, controlling your emotions is very important. Some people react in a negative way, but those with strategies tend to control their emotions better.
I hope this helps.