input: Text: Castaways of Eros By NELSON S. BOND Two families fought for the title to Eros, and only one could win. One had to outsmart the other—and both had to win over the unscrupulous United Ores Corporation. It was a problem worthy of a Solomon—and it had an ending even those embittered rivals could not foresee. Bobby couldn't help wishing Pop would stand up just a little bit straighter. Not that he was ashamed of Pop; it wasn't that at all. It was just that the Patrolman stood so straight, his shoulders broad and firm. Standing beside him made Pop look sort of thin and puny; his chest caved in like he was carrying a heavy weight on his shoulders. That was from studying things through a microscope. Anyhow, decided Bobby with a fierce loyalty, that S.S.P. man probably wouldn't even know what to look for if somebody put a microscope in front of him. Even if he was big and sturdy and broad-shouldered in his space blues. Mom said, "Bobby, what are you muttering about? Do stop fidgeting!" Bobby said, "Yessum," and glared at Moira, as if she, in some obscure way, were to blame for his having been reprimanded right out here in the middle of Long Island Spaceport, where everybody could hear and laugh at him. But Moira, studying the handsome S.S.P. man surreptitiously, did not notice. Dick was fixing something in the ship. Eleanor stood quietly beside Mom, crooning softly to The Pooch so it wouldn't be scared by the thunderous blast of rocket motors. Grampaw Moseley had buttonholed an embarrassed young ensign, was complaining to him in loud and certain terms that modern as
  Question: Why was Pop upset about leaving life on Earth?
  
   (A) He felt selfish for making the family join along in his endeavors to a new planet.
   (B) He ultimately knew that the mission would fail.
   (C) The family was forced to leave Earth even though they did not want to leave.
   (D) He knows that moving to Eros is not the best decision for the family. 
  Answer:
output: He felt selfish for making the family join along in his endeavors to a new planet.