Ramona Has an Idea for an Electric Animal Brush That

Ramona has an idea for an electric animal brush that vacuums the animal hair and transforms it into usable sewing thread. Ramona calls her device the Hair-2-Thread and begins selling the device in January. Later that year, she decides the device would sell better if she had a patent, and she files the patent application in December. After finally receiving the patent the following year, Ramona discovers a similar device, the HairSew, is being sold by Saya and files a patent infringement lawsuit.
-Which of the following statements, if true, would best support dismissal of the lawsuit against Saya?

A) Ramona sold her product before the patent was issued.
B) Ramona sold her product before filing her patent application.
C) Saya had the idea for the product ten years ago, but did not have time to perfect it.
D) Saya's product functions more efficiently than Ramona's product.
E) Saya's product, which contained the same ideas as in Ramona's patent, was already in existence before Ramona filed her patent application.