Q19 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)

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 disimilar, 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 disimilar, 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 disimilar, this fact highlights an interesting and often overlooked feature of fraternal-twin pairs, namely they vary considerably

Answer is B

i know A is not right because it should be "the fact that..."

"With .." on C doesnt modify "it" correctly..

and i am stuck with B, D, and E...

Also, i am quite confused with "namely that they vary considerably"

~thanks in advance~

namely that they vary considerably的意思那是他们是相当的不同的,是个同位语补充说明.B的结构抽象来看就是sth(that从句,就是加长版的sth)highlights feature, sth.的结构这样看是不是清楚点.

E的话语法上没问题,但是吧句子改成了原因状语从句了.D的话还是那个with修饰it的问题.