 Which word least describes Don?
Radio messages stated simply that Superior had seceded from Earth. Don hesitated, shrugged at the redhead, said, "Excuse me," and followed the conductor. Don made his way up to the locomotive and found a bigger knot of people gathered in front of the cowcatcher. Don saw two men who must have been the engineer and the fireman talking to an old bearded gentleman wearing a civil defense helmet, a topcoat and riding boots. Don looked at the fireman, who had an unbelieving expression on his face, then at the bearded old man, who was smiling and nodding.
 caring
 secretive  calm  inquisitive  caring