9. If someone is unmoved by other people's problems, you might say he shows a ________
indifference to human suffering.
(A) quiescent (B) callous (C) holistic (D) innocuous
(A) quiescent-quiet, not active (B) callous-cruel, without sympathy/feeling to others (C) holistic-focused on the whole aspect of sth (D) innocuous-harmless