The author discusses naturally occurring Pseudomonas fluorescens bacteria in the first paragraph primarily in order t...

Hello! This passage was particularly difficult because I'm not used to reading heavily scientific articles, and it just had a lot of information! I could eliminate answer choices a-c, leaving me with d and e. I chose E, which was obviously incorrect. I'm having trouble understanding why. Could someone please break down these two answer choices and explain why D works better than E? Thank you!