We live in a world in which crime is rampant, children are

You are not right!! Tomorrow i will come with examples

The question stem says

"We live in a world in which crime is rampant, children are recalcitrant, change is the only constant, and uncertainty prevails. "

Children are recalcitrant - IC
Change is the only constant - IC

Here IC separated by Commas instead of collan hence I stated as run on.. If I m wrng kindly help In my understanding regarding the same. Thanks

thanks for the thought. AB+AC+AD=A(B+C+D)

C

because the sentence should follow parallel structure

This question is a poor tool for practicing SC.
Its source is not official.
It creates conflict between two general rules: correct grammar and concision.
It also contravenes a few specific, subtler rules.

There are better and similar questions, for example, here, here, and here.

Hello, ishh0311. I am curious, what is the source of this question? For my part, and I do find myself pretty strong at SC questions, I would go with (B). Notice the barebones structure of the sentence: ... in which [noun] + is/are + [adjective]. Going through the answer choices:

(A) uncertainty prevails - This violates the is/are + [adjective] construct of the other items in the list, turning the adjective into a verb.
(C) in which... in which... in which - Why do we need the repetition of a clause trigger that can encompass multiple items (i.e. in which A, B, and C)?
(D) where - This is casual and not in parallel with in which. People often use the two interchangeably in conversation, but this is a grammar test, and Standard American English in its written form prevails.
(E) where - See above.

Please let me and everyone else know the answer. Thank you, and good luck with your studies.

- Andrew