ANSWER :
A. 6"
EXPLANATION :
Note that 1' = 12"
So 14' will be 14 x 12 = 168"
A carpenter cut three 4' 6".
Convert 4' into inches, that will be 4 x 12 = 48"
Then add 6", that will be 48" + 6" = 54"
Multiply this by 3 since the carpenter cut three pieces.
That will be 54" x 3 = 162"
So the carpenter cut a total of 162" from the 168" board.
Subtract it to get the remaining size.
168" - 162" = 6"