GWD 20-3不知该解是否有理?

Q3:

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

Wrong：D

Right：A

我自己理解是长的句子,同位语引导的定从好与介词短语引导的从句,对吗?

我的理解是:

1."with the intent of ensutring" is redundant

2.that指代不明，按意思应该是patients，那就是who了

3.没有插入语with紧跟在标点后的例句我没看到，不过不确定，存疑。