单选题 They have always regarded a man of ______ and fairness as a reliable friend.

【正确答案】 C
【答案解析】integrity正直，诚实；robustness精力充沛；健壮，体魄强健；temperament性格，气质；compactness(文体)简洁，简明。句意：他们总是把一个诚实公正的人作为一个可信赖的朋友。