Which statement expresses an opinion? a) the two enemies stood glaring at one another for a long silent moment. b) ulrich von gradwitz patrolled the dark forest in quest of a human enemy. c) the feud might have died down if the personal ill-will of the two men had not stood in the way. d) as boys they had thirsted for one another's blood; as men each prayed that misfortune might fall on the other.