In situations where it is difficult to make informed decisions about products, consumers should be provided with the relevant information.
Setup
Principle If it's difficult to make an informed decision about a product, consumers should be provided with the relevant information.
Example It was difficult to decide whether a given food product had nutritious ingredients, until we required food manufacturers to print nutritional info on the package.
Analogy Similarly, consumers want to make an informed decision about conserving energy, and it's difficult for consumers to determine how much energy was required to make a product.
The Blank
We know we're looking for a Conclusion that can be drawn, because the setup here was:
Since there's no easy way, .
Any time since/because starts off a sentence, then the second clause in the sentence is a conclusion supported by the first clause.
Evaluate
Like so many Fill-in-the-Blank questions, this one wants us to Complete the Analogy. We want to "carry over" what he heard about in the example of nutritional information on food products to what we're now talking about in relation to energy.
We're operating by this principle that says, .
It wasn't easy to decide if food products had nutritious ingredients, so manufacturers were required to print nutritional info on the packaging.
It's not easy to decide how much energy went into manufacturing a product, so manufacturers should be required to put information about how much energy it took to manufacture a product on the packaging.
Goal
We can be flexible about "required" and "packaging". The core component is that manufacturers should provide to consumers the relevant information about how much energy was used to make a product.