Answer:
I think D best describes the paragraph.
Explanation:
Sentence A only explains how the scientists used the technology. Barely any background information.
Sentence B only explains that they were successful with it. No background info at all.
Sentence C says nothing about the paragraph. It just gave an estimate of when the product would be completely available or the progression.
Sentence D explains how they‘ve been researching for the past 10 years and how they’ve been experimenting with it.
