Why C is incorrect?

@Yuer-Wang, Let's look at (C). (C) says, "Researchers are developing several new pumps designed to enhance human labor efficiency in processing facilities." In the first paragraph of the passage, the author explains that the motivation behind pump research is the safety of workers, not human labor efficiency. Thus, we can get rid of (C). Does this answer your question? Let us know if you'd like further clarification!