A – Incorrect modifier, Inventor’s mistake and product are not same
B – Same as A
C- Verb not paralle , CAN and has
D – Which is ambiguous and Product and called are not parallel
E – Correct Answer

The error in C is that “Informally known as…note” should be placed next to “a product” and should not be set off by commas.
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Initially considered an inventor’s mistake, a product informally known as the “sticky note,” which can stick to a surface without adhering permanently, has become one of the best-selling office supplies in history.
a. Initially considered an inventor’s mistake, a product informally known as the “sticky note,” which can stick to a surface without adhering permanently,
b. Initially considered an inventor’s mistake, the “sticky note,” having the ability to stick to a surface without adhering permanently, a product informally known as the “sticky note”
c. A product initially considered an inventor’s mistake, informally known as the “sticky note,” which can stick to a surface without adhering permanently,
d. A product initially considered an inventor’s mistake, called the “sticky note,” which has the ability to stick to a surface and without adhering permanently,
e. A product that was initially considered an inventor’s mistake and has the ability to stick to a surface and without adhering permanently, informally known as the “sticky note,”

ok i am not sure on the answer but my guess would be A.

B -> modifier errors . Repeating sticky note twice -> verbose.
C-> I think a Modifier error exists here , although i am not 100 % confident.
D -> incorrect modifier.
E -> Just looks weird, havent seen such construction in correct answers.

I am responding to your p.m. I am happy to give my 2¢ on this.

First of all, I am not particularly impressed with the quality of this question. The nature of the splits and the issues tests do not bear a strong resemblance to what the GMAT actually tests. I would recommend not relying too heavily on this source.

(A) no obvious error, though not a beautiful sentence --- to Rajesh560, I would say: In fact, "the inventor's mistake" is identical to the product --- that's the whole point of the sentence.
(B) repeats the phrase "sticky note" twice = WRONG
(C) it appears the clause "informally known as the 'sticky note'" modifies "investor's mistake", which is not precise = WRONG
(D) also has the modifier mistake, and the faulty parallelism "the ability to stick to a surface and without adhering permanently" = WRONG
(E) a nightmare trainwreck of a parallelism error : "... that was .... and has .... and without" = WRONG

That leaves (A) as the best answer. Again, if you abandoned this particular source, I think it could only benefit your studying.

Does all this make sense?

Mike
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Mike McGarry
Magoosh Test Prep