The sum looks as follows:
LMN
NOP
QRS
Since every digit must be used exactly once, the sum will be MINIMIZED if the blue digits are AS SMALL AS POSSIBLE and the red digits are AS BIG AS POSSIBLE, as in the following case:
1M7
2O8
3R9
Thus, the remaining 3 digits must be 4, 5, and 6:
147
258
369
774
The correct answer is C.
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