GMAT Sentence Correction (SC) | Re: The Lisbon treaty, ill-fated European Union constitution's

Let's take a look at that. Here's the sentence with the correct choice filledin:

The Lisbon treaty, successor to the ill-fated European Union constitution, which in turn followed the Maastricht, Amsterdam and Nice treaties would create a permanent club rulebook.

First, we can use the touch rule. Generally, modifiers starting with "which," "who," or "that" apply to the immediately preceding noun. In this case, that's constitution.

We can verify this with meaning.