Which one of these is a simple sentence?
A. Then the edges of the bark were gently bent upward to form the sides of the boat.
Bent to the shape of the boat, the wider ones are in the middle and the narrower ones are towards the ends.
C. Some sticks were fixed into the ground at a distance of three or four feet from each other, forming the curved line that the sides of the boat were intended to make.
D. The bark was then spread on the ground.
