Lambic pentameter was used for the nobles' speech while blank verse or prose was used for commoners. This could be to create a distinction between the classes and to show that the nobles were intelligent, as iambic pentameter has a natural rhythm.
The fourth excerpt should be right
Because the organization depends on how you will be making the essay because if you did order of importance than your central idea would most likely be developed in the beginning, but if it was like order of like same and difference then the central idea would be tough to put in you would have to put the central idea at the end to clarify why you did the order of same and difference.