How will the right answer fit in terms of support and conclusion?

Only the right answer will accurately complete the conclusion in the prompt with what these two disagree about.

Highlight the main conclusion in the passage, if there is one:

Vincent: it cannot be measured.

Yolanda only implies a conclusion, but doesn’t actually give support for anything she says.

Vincent: [SUPPORT], and since [SUPPORT], [CONCLUSION].

Yolanda: [SUPPORT]. [SUPPORT].

Map the wording of the answers to the wording of the passage:

(A) Happiness in an entirely subjective experience.

This matches one of Vincent’s premises. But Yolanda didn’t say anything about “happiness” specifically, only “happiness research”.

(B) Optometry is a scientific discipline.

Only Yolanda mentions optometry.

(C) A scientific discipline can rely on subjective reports.

Vincent says a “scientific discipline” has to be measured, and to be measured it can’t be subjective. So he disagrees with this answer. Yolanda implies that she agrees, since she says that optometry both “relies on patients’ reports” and “is a scientific discipline”.

(D) …as much a scientific discipline as optometry is.

Again, only Yolanda mentions optometry. And she doesn’t make the comparison this specifically, so we really can’t say either of them agrees or disagrees for sure.

(E) Experiences that cannot be measured…

…are never mentioned as a group. Vincent only gives one example when this is the case, and Yolanda didn’t say anything about “entirely subjective experiences”.

(C) is the correct answer.