请教一道GWD的题目

nancyguona

12．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.

 

1. rules intended to ensure that at least one nurse is assigned for every four patients put through triage in a hospital emergency room
2. 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
3. rules intending to ensure at least one nurse is assigned for every four patients in a hospital emergency room put through triage
4. 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
5. 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

麻烦讲解以下做题的思路以及最后的答案，非常感谢~

dphxmg

I consider A the key.

B. intent of doing sth is not idiomatic. The right idiom is "intent to do sth". "at least" should modify "one nurse"
C. It is the state not rules that intends to do sth. Patients not the hospital are the object of "put through triage".
D. "intent of doing sth" is not idiomatic. "ensure that subject + should +verb" is wrong. The clause following ensure is usually in the present simple tense. "in a hospital emergency room" should be put behind "triage".
E. "this" refers ambiguously. The loaction of at least.

nancyguona

thank you very much for your explanation of this sentence correction question~