What number should replace the question mark?

The correct answer is Option (1) → 5

The centre number is the sum of one diagonal pair minus the sum of the other: (top-left + bottom-right) − (top-right + bottom-left).

• First figure: \((13+5)-(4+12)=18-16=2\)

• Second figure: \((23+32)-(9+22)=55-31=24\)

• Third figure: \((2+24)-(9+12)=26-21=5\)