The volume would be 5 because in order to find volume you need to divide mass over density. V=m/d
No worries bro your answer is correct the computer is wrong it happens
The dimensions of the rectangle given are
length = 14 meters
Width = 8 meters
The perimeter of the rectangle is given by the sum of its sides
The rectangle has to opposite sides of 14 meters and two opposite sides of 8 meters
Hence adding up the 4 sides we get

Hence option B is the right answer