Answer:
Orange, Blue, Red, Green.
Orange would be the best deal.
Step-by-step explanation:
In order to put the unit costs per square foot from least to greatest, let's find the unit cost per square root of each wrapping paper.
To find the unit cost per square root, we simply have to divide the cost over the amount of square feet. So:
Red:

Blue:

Green:

Orange:

So, to cost of wrapping paper per foot from least to greatest is:
Orange, Blue, Red, Green.
So, orange would be the best deal.
And we're done!