In a calorimetry experiment, three samples A, B, and C with TA > TB > TC are placed in thermal contact. When the samples have reached thermal equilibrium at a common temperature T, which one of the following must be true?

(a) QAB QC
(b) QA< 0, QB <0, and Qc0
(c) T> TB
(d) T (e) TA > T> Tc