Consumer advocate: The toy-labeling law should require manufacturers to provide explicit safety labels on toys to indicate what hazards the toys pose.
Conclusion
The toy-labeling law should require manufacturers to provide explicit safety labels on toys to indicate what hazards the toys pose.
Evidence
The only labels currently required by law indicate the age range a toy is intended for (e.g., "three and up" for choking hazards).
Parents could prevent such injuries almost entirely if toy labels provided explicit safety information.
Evaluate
Whenever we do Main Conclusion / Role, we prime our brain for "upside down arguments" where we hear the conclusion before we hear the support.
Since the first sentence feels like an author Opinion ("should"), we listen to hear if it's supported by what follows, in which case it would be the main conclusion!
Indeed, the subsequent discussion of current age-range labels and the potential of explicit safety information is offered as support for that recommendation.
Goal
We're being asked about the first sentence, so we would want an answer that says "main conclusion" or something equivalent.