​Select the number from among the given alternatives that can replace the question mark (?) in the last figure.​

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Logic: Upper Number Multiply equal to lower number.

1sr Figure: (9 × 4) = 36

2nd Figure: (8 × 7) = 56

3rd Figure: (6 × 8) = 48

So, the missing number: 4

Thus, the correct option is:​​(a)