Clothes made from natural fibers such as cotton, unlike clothes made from artificial fibers such as polyester often shrink when washed at high temperatures. The reason for this shrinkage is that natural fibers are tightly curled in their original state. Since the manufacturer of cloth requires straight fibers, natural fibers are artificially straightened prior to being made into cloth. High temperatures cause all fibers in cloth to return to their original states. Which one of the following is most strongly supported by the information above? ['High temperatures have no effect on the straightness of fibers in clothes made from a blend of natural and artificial fibers.', 'Artificial fibers are straight in their original state.', 'Clothes made from natural fibers stretch more easily than do clothes made from artificial fibers.', 'If natural fibers that have been straightened and used for cloth are curled up again by high temperatures, they cannot be straightened again.']