If the regulation of computer networks is to be modeled on past legislation, then its model must be either legislation regulating a telephone system or else legislation regulating a public broadcasting service.
Implied Conclusion
The regulation of computer networks shouldn't be modeled on past legislation.
Evidence
Modeling it on past legislation would mean using Phone legislation or Public Broadcasting legislation.
Intermediate Conclusion (thus)
Neither of those models are appropriate for computer networks.
Evidence
Computer networks serve as private message services as well as publicly accessible information services. Modeling it on Phone legislation means computer networks would only be responsible for transmission. Modeling it on Public Broadcasting means it would also be responsible for content.
Evaluate
I'll be honest; I'm pretty lost about how the author derives her Intermediate Conclusion at the end. I don't really understand how she disqualified both models from being appropriate for computer networks.
But to get this question right, we don't really need to understand that.
When a question stem says that a stimulus is structured to lead to which conclusion, it means we never actually heard the explicit conclusion they're asking for. Instead, the paragraph is designed to let us infer that conclusion.
This twist on Main Conclusion has only shown up on very old tests, and when it shows up, it usually feels like one of these options:
1) the stimulus asks a question, and then provides enough info that we figure out how the question should be answered. (e.g. ... implied conclusion: he shouldn't ask her)
2) the stimulus lays out a few options, and then provides enough info that we can rule out all but one option, so the implicit conclusion is the remaining option.
This one feels sort of like a hybrid of the two. You can imagine the first sentence being a question: By the end of the paragraph, we're thinking, "nope!"
Or we can think of it like there are a few options: 1) model it on past Phone legislation 2) model it on past Public Broadcasting legislation 3) don't model it on past legislation
The argument kills the first two options and leaves us with the third.
Goal
Let's look for something like, .