If 'R' stands for '+', 'K' stands for '×', 'G' stands for '+' and 'D' stands for '−', what will come in place of the question mark (?) in the following equation? 32 G 15 R 15D 17 K 18 = ?

1. A.-235
2. B.-273✓ Correct
3. C.-456
4. D.-879

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