Answer:
D. Bethlehem.
Step-by-step explanation:
It is important to note that Ruth herself did not return, but rather Naomi did, who is her mother-in-law. Ruth simply stayed by the side of Naomi. Quote from the Bible,
Don't urge me to leave or turn back from you. Where you go I will go, and where you stay I will stay. (Ruth 1:16)
It is later stated in verse 19 in to which city they came to, quote:
So the two women went on until they came to Bethlehem. (Ruth 1:19)
Therefore, your answer is Bethlehem.
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Sources:
New International Version (NIV).