HELP PLEASE IM TAKING A QUIZ AND I DONT KNOW THE ANSWER !!!!!! darla is making a blanket that is 12 feet long and 6 feet wide. if she is sewing a ribbon around the blanket, how much ribbon will she need for the border of the blanket

a: 72 feet
b: 72 square feet
c: 36 square feet
d: 36 feet