What number should replace the question mark?

The correct answer is Option (3) → 4

In each triangle the number inside is twice the sum of the three corner numbers.

• Triangle A: \((3+7+5)\times2=15\times2=30\)

• Triangle B: \((10+14+12)\times2=36\times2=72\)

• Triangle C: \((9+13+1)\times2=23\times2=46\)

• Triangle D: \((?+8+6)\times2=36\), so \(?+14=18\) and the missing number is 4