Sentence Correction

The state has proposed new rules that would set minimum staffing levels for nurses, rules intended to ensure that at least one nurse is assigned for every four patients put through triage in a hospital emergency room.

A. rules intended to ensure that at least one nurse is assigned for every four patients put through triage in a hospital emergency room
B. rules with the intent of ensuring one nurse at least to be assigned for every four patients to be put through triage in a hospital emergency room
C. rules intending to ensure at least one nurse is assigned for every four patients in a hospital emergency room put through triage
D. with the intent of ensuring that at least one nurse should be assigned for every four patients in a hospital emergency room that are put through triage
E. and this is intended to ensure one nurse at least to be assigned for every four patients put through triage in a hospital emergency room

[spoiler]
Ans is A[/spoiler]

Lets take up same old POE...

B....rules with the intend, is wrong way of sending a message. Are the rules intending something or the people of state? Answer is people of state. Hence ignore.
C....same problem as B. Ignore
D...this is good one. But, problem is use of "that", which makes the whole sense absurd. Is it patient going thru triage or the hospital room? Ignore.

E...what is "this" refering to? Proposal or the implementation of proposal.

Hence A.

First thing you should note when looking at this one is that the example sentence is grammatically correct, and there are no obvious errors. This puts you on the alert that A may be the answer. After that, eliminating is easy:

B -- 'at least' is out of order in the sentence.
C-- makes it look like hospital rooms are in triage, not the patients, which is absurd.
D -- same as C
E -- wordy

Easy peasy lemon squeezy!