C

In liver disease the liver synthesizes dysfunctional (“dys-”) fibrinogen, so PT, aPTT and thrombin time are all prolonged while the fibrinogen level and platelet count can remain normal; this pattern is not seen in DIC (low fibrinogen, low platelets), factor VIII deficiency (only aPTT ↑) or vitamin K deficiency (TT normal) [Palascak 1977, PMID 874092].