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

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Logic: The sum of the outer 4 numbers is equal to the multiply of the inner numbers:

Outer Numbers figure no 1: 3 + 4 + 2 + 5 = 14

Multiply inner numbers: 2 $$\times$$ 7 = 14.​

​Outer Numbers figure no 2: 2 + 7 + 5 + 1 = 15.

Multiply inner numbers: 3 $$\times$$​ 5 = 15.

​Outer Numbers figure no 3: 6 + 1 + 1 + 4 =12.

Multiply inner numbers: 4 $$\times$$​ 3 = 12.

Now, the next digit will be: 4.

Thus, the correct option is (b) 4.