Request you to please clarify my below doubt -
Recently implemented “shift-work equations” based on studies of the human sleep cycle have reduced sickness, sleeping on the job, fatigue among shift workers, and have raised production efficiency in various industries.(C) and fatigue among shift workers while raising
I understand that the choice C is the best choice among all, however, I am trying to understand what role the phrase "while raising" is playing.
I know that while is working as preposition here, and "raising production efficiency" is the object of the preposition. But, how do I make sure that it is working as Adverbial Modifier. Generally, Adverbial modifiers answer the question "How"? but this does not make any sense while applying the concept here.
Such as -
Question -How shift work equations reduced the fatigue.
Answer - while raising production efficiency? ---> This does not make any sense.Illogical
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