Explantion

You learn at the end of the sentence that Hursthouse puts forth the same views as many other virtue ethicists. So in the first blank, you want something like representative of. The only match is emblematic of. You then learn that Hursthouse thinks ethics is “neither situational nor utilitarian” — the next part of the sentence will have a first part that matches up with situational, and a second part that matches up with utilitarian, (GRE sentences often use a pattern of mentioning two things, and then giving more information about those two things in the same order.)

Base one’s judgments on subjective concerns refers back to a situational approach to ethics, and a __________ weighing of pain and pleasure refers back to a utilitarian (or practical) approach. Thus, pragmatic, which means “practical,” matches. Finally, critics would definitely agree with the idea that virtue ethicists “seek to enshrine their own prejudices,” so in the third blank, you just need a word like say or claim. Posit is the only match.

Emblematic of, pragmatic, posit.