OG SC # 81, Ulcer Problem

enjoylife1788 wrote:Hi all,

This is one of the OG's SC question. I have also mentioned the solution explanation given by the OG.

I have one question about the Answer Choice: A. Solution says that its incorrect because of omission of "by" at the end of the sentence. But there is one more difference in this choice than the correct choice C.

A: not caused by stress, alcohol, or rich foods, but
C: caused not by stress, alcohol, or rich foods, but by.

So my question is, if i add "by" at the end of answer choice A, will it make A the correct answer. Note: There is still the difference "not caused by" vs "caused not by". So which is correct.

Please reply. Thanx in advance


Recently physicians have determined that stomach
ulcers are not caused by stress, alcohol, or rich foods,
but a bacterium that dwells in the mucous lining of the
stomach.
(A) not caused by stress, alcohol, or rich foods, but
(B) not caused by stress, alcohol, or rich foods,
but are by
(C) caused not by stress, alcohol, or rich foods,
but by
(D) caused not by stress, alcohol, and rich foods,
but
(E) caused not by stress, alcohol, and rich foods,
but are by
Parallelism; Diction
Th e formula used in this sentence not this but that
requires parallel elements following not and but.
Th is means that not by stress, alcohol, or rich foods
must be balanced by but by a bacterium … Th ere is
no need to repeat the verb are caused, or even the
auxiliary verb are, because the verb precedes the
not by … but by … formula. Th e substitution of
the conjunction and for the conjunction or
changes the meaning of the sentence: Stress,
alcohol and rich foods identifi es the combination of
these three factors as a suggested cause of
stomach ulcers, whereas stress, alcohol, or rich foods
off ers three individual possibilities. Th ere is no
way to tell which one of these is the intended
meaning of the sentence.
A To preserve parallelism, but should be
followed by by.
B Th ere is no reason to repeat the auxiliary
verb are.
C Correct. Th is sentence correctly uses the not
by … but by … formula.
D To preserve parallelism, but should be
followed by by.
E To preserve parallelism, but should be
followed by by.
Th e correct answer is C.

enjoylife1788 wrote:So the two possible correct answers are:
1) not caused by stress, alcohol, or rich foods, but caused by
2) caused not by stress, alcohol, or rich foods, but by

Am i right?

enjoylife1788 wrote:So when u say that it differs from case to case, it confuses me.

Isnt it right to say that both the formats are correct:

1) verb not by but by
2) not verb by but verb by

Could you please correct me if am wrong and also explain where it differs with any example. I will really appreciate it.