input: Text: Doorway to Kal-Jmar By Stuart Fleming Two men had died before Syme Rector's guns to give him the key to the ancient city of Kal-Jmar—a city of untold wealth, and of robots that made desires instant commands. The tall man loitered a moment before a garish window display, his eyes impassive in his space-burned face, as the Lillis patrolman passed. Then he turned, burying his long chin in the folds of his sand cape, and took up the pursuit of the dark figure ahead once more. Above, the city's multicolored lights were reflected from the translucent Dome—a distant, subtly distorted Lillis, through which the stars shone dimly. Getting through that dome had been his first urgent problem, but now he had another, and a more pressing one. It had been simple enough to pass himself off as an itinerant prospector and gain entrance to the city, after his ship had crashed in the Mare Cimmerium. But the rest would not be so simple. He had to acquire a spaceman's identity card, and he had to do it fast. It was only a matter of time until the Triplanet Patrol gave up the misleading trail he had made into the hill country, and concluded that he must have reached Lillis. After that, his only safety lay in shipping out on a freighter as soon as possible. He had to get off Mars, because his trail was warm, and the Patrol thorough. They knew, of course, that he was an outlaw—the very fact of the crashed, illegally-armed ship would have told them that. But they didn't know that he was Syme Rector, the most-wanted and most-feared raider in the System. In that was his only advantage. He walked a little faster, as his quarry turned up a side street and then boarded a moving ramp to an upper level.
  Question: What happened when the Martians initially split into two populations?
  
   (A) One population thrived and the other died out
   (B) Both populations suffered as a result of the split
   (C) Both populations eventually combined once more
   (D) Both populations succeeded and thrived, but in very different ways
  Answer:
output: One population thrived and the other died out