Help Robin find the missing number.

The correct option is A 12
Let's see what rule is followed to obtain the number in the center in each case.
9 + 28 + 72 + 60 = 169
Hence, $\sqrt{169}$ = 13

Similarly,9 + 12 + 36 + 24 = 81
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, $\sqrt{81}$ = 9

So, we can find '?' in a similar way:48 + 41 + 23 + 32 = 144
Hence, $\sqrt{144}$ = 12