input: Text: (A) They are illegal space travelers. This is significant because the crimes of explorers like them are what prompted the Groaci to hide the first human cruiser that arrived. (B) They are colonialists. This is significant because it is Miss Meuhl and Retief’s desire to colonize Groac that fuels the Groacian hatred of foreigners. (C) They are slaves. This is significant because it helps the reader understand that Retief is lashing out as a result of being oppressed for so long. (D) They are aliens. This is significant because Groacians see humans as alien to their planet, which helps the reader understand how prejudice develops on Groac. THE MADMAN FROM EARTH BY KEITH LAUMER You don't have to be crazy to be an earth diplomat—but on Groac it sure helps! I "The Consul for the Terrestrial States," Retief said, "presents his compliments, et cetera, to the Ministry of Culture of the Groacian Autonomy, and with reference to the Ministry's invitation to attend a recital of interpretive grimacing, has the honor to express regret that he will be unable—" "You can't turn this invitation down," Administrative Assistant Meuhl said flatly. "I'll make that 'accepts with pleasure'." Retief exhaled a plume of cigar smoke. "Miss Meuhl," he said, "in the past couple of weeks I've sat through six light-concerts, four attempts at chamber music, and god knows how many assorted folk-art festivals. I've been tied up every off-duty hour since I got here—" "You can't offend the Groaci," Miss Meuhl said sharply. "Consul Whaffle would never have been so rude." "Whaffle left here three months ago," Retief said, "leaving me in charge." "Well," Miss Meuhl said, snapping off the dictyper.
  Question: What is the simplest description of what Miss Meuhl and Retief are in the minds of the Groacian race? Why is this significant to the story? 
  Answer:
output: They are aliens. This is significant because Groacians see humans as alien to their planet, which helps the reader understand how prejudice develops on Groac.