The perimeter of the top is
.. 2*(1 1/3 +3) = 2*(4 1/3) = 8 2/3 . . . . feet
Then the lateral area is
.. (6 ft)*(8 2/3 ft) = (48 +4) ft^2 = 52 ft^2
The area of the top is
.. (3 ft)*(1 1/3 ft) = (3 +1) ft^2 = 4 ft^2
The total area Fran wants to paint is
.. total area = lateral area + top area
.. = (52 ft^2) + (4 ft^2) = 56 ft^2
Selection C is appropriate.