Explanation

First simplify inside the parentheses:

39 – (25 – 17) = 39 – 8 = 31

You could also distribute the minus sign to get 39 – 25 + 17 if you prefer. Quantity B is equal to –3, so Quantity A is greater. If you noticed right away that the minus sign would distribute in Quantity A but not Quantity B, you could have picked (A) without doing any arithmetic.

Hence option A is correct!
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