Please explain....

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src_saurav: Master | Next Rank: 500 Posts; Posts: 145; Joined: Sun Mar 15, 2015 7:27 amFollowed by: 1 member; Thanked: 2 times

by src_saurav » Tue Jul 14, 2015 9:25 pm

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.)

(A) fatigue among shift workers, and have raised

(B) fatigue among shift workers, and raised

(C) and fatigue among shift workers while raising

(D) lowered fatigue among shift workers, and raised

(E) and fatigue among shift workers was lowered
while raising

I came down to B and C . I chose B because it has few words than C. The OA is C. PLease explain the technique .

Source: Beat The GMAT — Sentence Correction | Tue Jul 14, 2015 9:25 pm

GMATGuruNY: GMAT Instructor; Posts: 15539; Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members; Location: New York, NY; Thanked: 13060 times; GMAT Score:790

by GMATGuruNY » Wed Jul 15, 2015 2:10 am

src_saurav wrote: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.

(A) fatigue among shift workers, and have raised

(B) fatigue among shift workers, and raised

(C) and fatigue among shift workers while raising

(D) lowered fatigue among shift workers, and raised

(E) and fatigue among shift workers was lowered
while raising

In a list of PARALLEL FORMS serving the SAME FUNCTION, a conjunction must precede the final entry.
Here, "shift-work equations" have reduced three things:
sickness
sleeping on the job
fatigue among shift workers.
Thus, the final entry in the list -- fatigue among shift workers -- must be preceded by a conjunction, as in C and E:
Recently implemented “shift-work equations” have reduced sickness, sleeping on the job, AND fatigue among shift workers.
Eliminate A, B and D.

In E, have reduced and was lowered are redundant.
Eliminate E.

The correct answer is C.

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