Emptiness , not everyone sees people as company for example - introverts , and socializing can be exhausting for them and can be overwhelming for them Or even maybe spending too much time on social media , or not being emotionally available .
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D is probably most likely.
A "run-on sentence" is a sentence with seemingly no end.
Answer:
The lost dog had a forlorn state before returning to its owner.
Explanation:
I do not have a correct explanation for it, but the only thing I can say it that it looked good to me grammatically and logically.