Select the option that best explains the information conveyed in the sentence.
My son, who is in the U.S.A. is studying Engineering?

A. my only son in the U.S.A studying Engineering
B. one of my sons is in the U.S.A studying Engineering  
C. my sons are in the U.S.A but only one is studying Engineerin
D. only son in in U.S.A studying Engineerin

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Correct Answer: B