Read the following passage and questions, then choose the right answer from options, the answer should be one of A, B, C, D.

<passage>:
Groaci wish only friendship with the Terrestrials, but—" "Don't!" Retief jumped—too late. Retief exhaled a plume of cigar smoke. "You're violating Terrestrial territory, Shluh," Retief said steadily. "Whaffle left here three months ago," Retief said, "leaving me in "I suggest you move back out the same way you came in." "Never mind the excuses," Retief said. "Just tell him I won't be "You're making a serious mistake, Shluh," Retief said. "I don't recall dictating any letters today, Miss Meuhl," Retief said, Mr. Retief to his quarters in this building—" Retief looked thoughtfully at Miss Meuhl. "You've been here on Groac "Why?" "The Groaci are a very sensitive race. They don't welcome outworlders raking up things. They've been gracious enough to let us live down the fact that Terrestrials subjected them to deep humiliation on one occasion." "You mean when they came looking for the cruiser?" "They never found the cruiser, did they?" disapproval as he closed the door. The pale-featured Groacian vibrated his throat-bladder in a distressed bleat. "To enjoy a cooling drink," Retief said in Groacian, squatting down at "I've changed my mind," Retief said to the bartender. "To be grateful door. The other Groaci released him, hurried back inside. Retief looked Retief backed away. Retief stepped around him, seized his collar and yanked. The Groacian Retief put a foot against his chest and pushed. "To not be going anywhere for a few minutes," Retief said. "To stay "Government men, I imagine. Word travels fast." Retief pulled off his indicative of rank rose as Retief entered the room. Neither offered a courteous snap of the mandibles, Retief noted. They were mad, all right. "Never mind that," Retief said. "These gentlemen didn't come here to to hospital suffering from serious contusions. Questioning of this individual revealed that he had been set upon and beaten by a foreigner. A Terrestrial, to be precise. Investigation by my department indicates that the description of the culprit closely matches that of the Terrestrial Consul." Miss Meuhl gasped audibly. "Just keep that recorder going," Retief snapped. episode! And you—" "Terrible? I understand that a Terrestrial task force stood off Groac and sent a delegation down to ask questions. They got some funny answers, and stayed on to dig around a little. After a week they left. "Why did the government fall, Fith? It was just after the task force paid its visit, and before the arrival of the first Terrestrial diplomatic mission." "This is an internal matter!" Fith cried, in his faint Groacian voice. "The new regime has shown itself most amiable to you Terrestrials. It has outdone itself—" "—to keep the Terrestrial consul and his staff in the dark," Retief Retief turned a steady look on Miss Meuhl. She closed her mouth. The "Funny thing about these animals. They wore clothes. They seemed to communicate with each other. Altogether it was a very amusing exhibit. "Tell me, Shluh, what happened to those six Terrestrials after the parade was over?" Fith made a choked noise and spoke rapidly to Shluh in Groacian. Shluh mouth, closed it and blinked rapidly. "How did they die?" Retief snapped. "Did you murder them, cut their throats, shoot them or bury them alive? What amusing end did you figure out for them? Research, maybe? Cut them open to see what made them narco-interrogation would get that out of any Groacian who saw the parade." "Yes," Fith said weakly. "It is true, they were Terrestrials. But there was no killing." "They're alive?" "Alas, no. They ... died." Miss Meuhl yelped faintly. "I see," Retief said. "They died." foods—" "Didn't take the trouble to find out, either, did you?" "They fell ill," Fith said. "One by one...." "We'll deal with that question later," Retief said. "Right now, I want more information. Where did you get them? Where did you hide the ship? "There were no more! Absolutely, I assure you!" "Killed in the crash landing?" "No crash landing. The ship descended intact, east of the city. The ... Terrestrials ... were unharmed. Naturally, we feared them. They were strange to us. We had never before seen such beings." "How could we know?" Fith moaned. felt it was as well they ... did not survive. Then, when the warships "Where is the ship?" "What did you do with it? It was too big to just walk off and forget. Where is it?" "Miss Meuhl," Retief said. "If I don't come back in a reasonable length Retief stooped under the heavy timbers shoring the entry to the cavern. Retief walked along the raised wooden catwalk, studying the ship. Empty "How did you get it in here?" Retief asked. Retief grunted. "Let's go inside." Retief clambered up a narrow companionway, glanced around the interior "I've seen enough," Retief said. "We were at fault," Fith said abjectly. "Now we wish only friendship." Retief looked grimly at the slender Foreign Office official. "Where is "Where is that ship?" Retief rapped out. "You never learn, do you? Retief eyed Fith. "Don't try it," he said. "You'll just get yourself in Fith clacked his mandibles angrily, eye stalks canted aggressively toward the Terrestrial. "Out of deference to your diplomatic status, Terrestrial, I shall ignore your insulting remarks," Fith said in his reedy voice. "Let us Retief looked at the four policemen. "I see your point," he said. where!" "The Groaci don't know. They're a very cultured, gentle people. You can do irreparable harm to the reputation of Terrestrials if you insist—" "That's my decision," Retief said. "I have a job to do and we're indignation. "You're like a ... a...." "You and I are in a tight spot, Miss Meuhl. The logical next move for the Groaci is to dispose of both of us. We're the only ones who know what happened. Fith almost did the job this afternoon, but I bluffed him out—for the moment." Retief, rose and snapped on a light, turned to stare. "What in the world—Where have you been? What's happened to your clothing?" "I got a little dirty. Don't worry about it." Retief went to his desk, "I have a message to get off first, Miss Meuhl," Retief said sharply. "That's right," Retief said calmly. "Now—" "Get that sender going, woman!" Retief snapped. "This is important." "I've already done so, Mr. Retief!" Miss Meuhl said harshly. "I've been "He's here now," Miss Meuhl said to the screen. She looked at Retief have been completely dispelled by what you've just told me." Retief looked at her levelly. "You've been a busy girl, Miss Meuhl. Did you mention the six Terrestrials who were killed here?" "That had no bearing on the matter of your wild behavior! I must say, Retief reached out and snapped off the communicator. The triumphant Retief went on earnestly, "I've found the missing cruiser." "You heard him relieve you!" Retief ignored Miss Meuhl's fury as he spoke into the recorder.

<question>:
Why was Retief still upset after seeing the ship?

<options>:
A He found something at the ship he wasn't expecting.
B The Groacians wouldn't show him inside of the ship.
C There was a much larger ship still unaccounted for.
D He's upset about the deceased Terrestrials he found.

<answer>:

C