Vincent: No scientific discipline can study something that cannot be measured, and since happiness is an entirely cannot be measured.
Yolanda: Just as optometry relies on patients' reports of what they see, happiness research relies on subjects' reports of how they a scientific discipline.
What this question is testing
Your task
Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.
Common trap
Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.
Winning move
Predict what a right answer must do, then test each choice against the conclusion-evidence gap.
Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.