input: Text: THE PERFECTIONISTS By ARNOLD CASTLE ILLUSTRATED by SUMMERS Is there something wrong with you? Do you fail to fit in with your group? Nervous, anxious, ill-at-ease? Happy about it? Lucky you! Frank Pembroke sat behind the desk of his shabby little office over Lemark's Liquors in downtown Los Angeles and waited for his first customer. He had been in business for a week and as yet had had no callers. Therefore, it was with a mingled sense of excitement and satisfaction that he greeted the tall, dark, smooth-faced figure that came up the stairs and into the office shortly before noon. "Good day, sir," said Pembroke with an amiable smile. "I see my advertisement has interested you. Please stand in that corner for just a moment." Opening the desk drawer, which was almost empty, Pembroke removed an automatic pistol fitted with a silencer. Pointing it at the amazed customer, he fired four.22 caliber longs into the narrow chest. Then he made a telephone call and sat down to wait. He wondered how long it would be before his next client would arrive. The series of events leading up to Pembroke's present occupation had commenced on a dismal, overcast evening in the South Pacific a year earlier. Bound for Sydney, two days out of Valparaiso, the Colombian tramp steamer Elena Mia had encountered a dense greenish fog which seemed vaguely redolent of citrus trees. Standing on the forward deck, Pembroke was one of the first to perceive the peculiar odor and to spot the immense gray hulk w
  Question: What caused the explosion that sunk the Elena Mia?
  
   (A) An alien craft fired on the Elena Mia from under the water.
   (B) A Colombian ship fired a torpedo on the Elena Mia, causing it to explode.
   (C) The Elena Mia ran into an iceberg. The ice pierced the ship's electronics causing an explosion.
   (D) The androids tampered with the Elena Mia's electronics causing an explosion.
  Answer:
output: An alien craft fired on the Elena Mia from under the water.