  There are four possible responses to objections of this sort: (a) Noncognitivism, which says that, despite appearances to the contrary, claims from the flagged domain are not truth-evaluable to begin with, e.g., moral claims are commands or expressions of emotions disguised as truthbearers; (b) Error theory, which says that all claims from the flagged domain are false; (c) Reductionism, which says that truths from the flagged domain correspond to facts of a different domain regarded as unproblematic, e.g., moral truths correspond to social-behavioral facts, logical truths correspond to facts about linguistic conventions; and (d) Standing firm, i.e., embracing facts of the flagged domain.