Every one of the police reports have been filed so that they

Every one of the police reports have been filed so that they can be located either by their case number, the date they were created, or the victim's last name.

A)have been filed so that they can be located either by their case number, the date they were created, or the victim's last name

B) have been filed so that they can be located either by their case numbers, the dates they were creaed, or by the victim's last names

C) has been filed so that they can be located either by their case number, the date they were created,or the victim's last name

D) has been filed so that it can be located either by its case number, the date it was created, or the victim's last name

E) has been filed so that it can be located either by its case number, the date it was created, or by the victim's last name -- not an either/or case --incorrect parallel list

D is correct because it makes the most precise parallelism: "either by its case number, the date it was created, or the victim's last name ".

Please Kudos if it helps

Why D is correct?

I find E maintains parallelism in it.
either by X or by Y

Both in option D and E, we have "either by", so IMO rest of the items also should have "by" to maintain parallelism.

I am convinced neither by D nor by E ?
Or
I am convinced neither by D nor E ?

Can someone explain ?

E commits a violation in the parallel structure. This is an important pattern in gmat.
by X,Y,Z /// by X, by Y, by Z
both of them are correct. Other structures like the one in E is wrong.

==================
feel free to gift a kudos if you find my post helpful.

I fail to understand why E option is not parallel: can anyone explain why it is wrong

Sent from my MI MAX 2 using GMAT Club Forum mobile app

As far as i see either by x or by y is a correct structure

Sent from my MI MAX 2 using GMAT Club Forum mobile app

You have "by" before case number, you have "by" before victim's last name but no "by" before "the date"..
So, not parallel StrugglingGmat2910.
Hope it's clear now.

Sent from my Redmi Note 4 using GMAT Club Forum mobile app

Now i understood. I understood E is in this format "by X, (modifies X) or by Y" - Only two branches X and Y.
But the answer needs to be "by X, Y or Z"

Hi Imyuva, the correct answer should be “ by x, y or z” or “by x, by y or by z”

Both are correct: In the first case, "by" is outside the parallel structure (hence used once and covers all the three elements), in the latter inside (hence repeated).

I am going with D. Reason

The structure "every one of the X's" is always singular. 
example:-
Every one of us is happy. 
Every one of the students is happy. 

So left with C, D and E

C) has been filed so that they can be located either by their case number, the date they were created,or the victim's last name. They cannot refer to Everyone. We need IT

D) has been filed so that it can be located either by its case number, the date it was created, or the victim's last name

E) has been filed so that it can be located either by its case number, the date it was created, or by the victim's last name . In E we have 3 things that need to be parallel. case number, the date it was created and the victim's last name. by using "BY" before the victim's last name its makes the sentence not parallel.

Everyone is singular so we need to use ‘has’ and after ‘either by’ we have a perfect parallel structure…..so correct choice is D

Hey Sayantanc

Just to be 100 percent sure

In a sentence

... either by X, Y or Z... is correct and you too agree that the option D has correct parallelism ?

Pls suggest.

Sent from my Redmi Note 4 using GMAT Club Forum mobile app

Every one of the police reports have been filed so that they can be located either by their case number, the date they were created, or the victim's last name.

A)have been filed so that they can be located either by their case number, the date they were created, or the victim's last name - Incorrect, Every one is singular and have is used so SV violation

B) have been filed so that they can be located either by their case numbers, the dates they were creaed, or by the victim's last names - Same as Option A

C) has been filed so that they can be located either by their case number, the date they were created,or the victim's last name - Use of they which is plural as incorrect as everyone is singular

D) has been filed so that it can be located either by its case number, the date it was created, or the victim's last name - CORRECT, maintains parallelism as all the three entities 1) Case Number 2) date it was created 3) Victim's last name are parallel and connected commonly by the marker "BY"

E) has been filed so that it can be located either by its case number, the date it was created, or by the victim's last name - Incorrect, violates parallelism as there is by before case number and victim's last name but no by before the date it was created.

Both the structures are correct - 1) BY X,Y,Z 2) either by X or by Y or by Z

So a straight Option D

IMO, this sentence has an inherent Structural flaw.

In "either X or Y" idiomatic construction, we can place only one list (word/phrase/clause) to replace X/Y. Hence, there has to be a parallelism of two lists (X // Y).

Whereas, in the stated sentence, we have two lists substituting X.

Posted from my mobile device

either X or Y :
the structure can take a list of 2 elements
if i have a list of 3 elements,OR can used.
X,Y,OR Z

Posted from my mobile device

i think in option D,either should not be there

According to my knowledge as per E-GMAT, either..or is a dual-word marker .. here in the question the list comprises of 3 elements.

Is my doubt valid?

As per Kaplan Prep 2018 that I have, "either" does not appear in any of the 5 options.