The quotation marks indicate that everything between them is passed as a string. This is not concatenating the variables, as it might seem at first.
The trim method removes whitespace from the beginning and end of a string.
The string is everything between the quotation marks. Since the string neither starts nor ends with spaces, nothing is trimmed.
A, B, and C are incorrect.
If the quotation marks were not present, A would have been correct.
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