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 is 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 Engineering
D
My only son is in the U.S.A studying Engineering
Verified Correct Answer: B.
Grammar & Contextual Explanation
The phrase "My son, who is in the U.S.A, is studying Engineering" contains a non-restrictive (or non-defining) relative clause ("who is in the U.S.A"). This means:
The sentence assumes that the speaker has more than one son (otherwise, the phrase would use "My only son").
The comma before "who" indicates that the information about being in the U.S.A is additional, rather than essential.
Therefore, it suggests that one of the speaker's sons is in the U.S.A and studying Engineering.
Source: Myschool Past Questions Archive (Record #10587)