According to the article, why did Lewis send Essaidi spider silk from genetically engineered silkworms?

A) Because he knew that spider silk from genetically engineered silkworms would be easier to combine with human skin

B) Because he didn't yet have enough spider silk from his goats to send hundreds of yards away

C) Because he believed that the silk from genetically engineered silkworms would stand a better chance of repelling bullets

D) Because he feared that her work would lower the quality of his spider silk from goats