​Study the given pattern carefully and select the number from among the given options that can replace the question mark (?) in it.​

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Logic: The sum of corner numbers of the square - the sum of middle numbers of the square = Missing number 

Outer square numbers: 7 + 5 + 6 + 12 = 30.

Inner square numbers: 7 + 8  + 3 + 2 = 20.

Now, the difference between them: 

30 - 20 = 10.

Thus, the correct option is (d) 10.