Answer:
East
Explanation:
If a Mother had four sons named North, South, and West, the first sons name is most likely East. This is because North, South, East, and West are the different directions you might see on a compase. Since she used 3 out of 4 of the names, it is likely that the other sons name is East.
Its C i just checked it on my test
To find the main idea of a text you can look for a common point among all sentences and look for a sentence that states the main idea.