albatross86 wrote:A. "The fact of twins resembling..." is unidiomatic when used in this context. The correct usage is "the fact that...". "Fact of" is typically used in context such as, "The fact of the matter is,... " or "This is a fact of life...."
We also lack a "that" after namely.

B. Correct. "That X resemble each other and Y look dissimilar highlights an interesting feature, namely that they vary...."

C. "it" is unreferred and vague.

D. with... it is a fact... this is grammatically flawed. "With... what is a fact?"

E. Because .... this fact.. what fact?

Using with or because alters the intent. The facts cannot be introduced like this.

I would say Pick B.

Abhay Is there any other error in Option C ?

gmatmachoman wrote:The fact of some fraternal twins resembling each other greatly and others looking quite dissimilar highlights an interesting and often overlooked feature of fraternal-twin pairs, namely they vary considerably on a spectrum of genetic relatedness.

A. The fact of some fraternal twins resembling each other greatly and others looking quite dissimilar highlights an interesting and often overlooked feature of fraternal-twin pairs, namely they vary considerably

B. That some fraternal twins resemble each other greatly while others look quite dissimilar highlights an interesting and often overlooked feature of fraternal-twin pairs, namely that they vary considerably

C. With some fraternal twins resembling each other greatly and others looking quite dissimilar, it highlights an interesting and often overlooked feature of fraternal-twin pairs, namely considerable variation

D. With some fraternal twins resembling each other greatly and others looking quite dissimilar, it is a fact that highlights an interesting and often overlooked feature of fraternal-twin pairs, namely a considerable variation


E. Because some fraternal twins resemble each other greatly and others look quite dissimilar, this fact highlights an interesting and often overlooked feature of fraternal-twin pairs, namely they vary considerably

albatross86 wrote:Sure, there are several acceptable usages in which you could start a sentence with "with".

eg. With great care, she placed the prize on the shelf.

Usage of WITH
RIGHT: The lions growled, WITH their fur STANDING on end
WRONG: WITH only 25% of the student body, seniors get 50% of the resources

albatross86 wrote:This one is from the MGMAT book:

Usage of WITH
RIGHT: The lions growled, WITH their fur STANDING on end
WRONG: WITH only 25% of the student body, seniors get 50% of the resources

Basically comma+with modifies the previous clause as an adverbial phrase so as long as it is describing the subject meaningfully, it is fine.

It counts as a non-essential modifier in this case.

In the wrong sentence, with is not introducing additional info - it is being used to contrast which is incorrect.