<span>more vitamin A
could help save traditional crops
more nutritious
These three statements show how the author is proving that Genetically Modified food is safe, and even further, that it's good for people. There are more vitamins, regular crops might be able to grow better, and they bring more nutrition to more people. </span>
I believe the answer is C. Jack killed the giant because he sold the cow for magic beans.
Jack chose to sell the beans and the giant just lived on the beanstalk. I think he killed the giant because it was disturbing the village or something like that.