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

<passage>:
"What outfit did you say you were with?" Dan asked. "The Inter-dimensional Monitor Service." "Inter-what?" Earth ... is this what is going to happen? I Clyde W. Snithian was a bald eagle of a man, dark-eyed, pot-bellied, in a loose cloak, he blinked small reddish eyes at Dan Slane's into Dan like hot pokers. "The Harriman paintings were removed from a locked vault," Dan said. nonsense. And throw this nincompoop out!" Snithian turned and stalked away, his cloak flapping at his knees. "Never mind that," Kelly said, escorting Dan along the corridor. He Dan looked around at the gray walls, with shelves stacked to the low such a target, the thieves were bound to show up. If Dan sat in the night-light over the door. When the thieves arrived, it might give him Eight hours, three sandwiches and six beers later, Dan roused suddenly shelving, a palely luminous framework was materializing in mid-air. The apparition was an open-work cage—about the size and shape of an They glowed, if anything, more brightly than the framework. moved jerkily, settling toward the floor. Long blue sparks jumped, settled against the floor. The spectral men reached for ghostly Dan, stepping out of the skeletal frame. In the dim light it now Dan, sitting rigid on the cot. The thin man placed a lantern on the popular with the sparrows." "Manny, sometimes I think your aspirations—" "Whatta ya talkin? I use a roll-on." Manny, turning to place a painting in the cage, stopped dead as he caught sight of Dan. The painting I'm doing a fast fade." "Wait a minute!" Dan shouted. "I'd like to make a deal with you Dan looked about wildly. The voice seemed to be issuing from a speaker. "Mr. Kelly, I can explain everything!" Dan called. He turned back to "Look—I want to go with you!" Dan shouted. Dan whirled to the cot, grabbed up the pistol Kelly had supplied. He the time machine." "Are you nuts?" Manny demanded. "You can't leave me here!" Manny spluttered, watching Dan crowd into The balding man snatched suddenly for the gun. Dan wrestled with him. "Manny!" Fiorello released his grip on Dan, lunged to aid his heels. Dan clung to the framework as Fiorello grappled with Kelly. A cop pushed past them, spotted Dan, moved in briskly for the pinch. Dan Sudden silence fell as the walls of the room glowed blue. A spectral Kelly capered before the cage, fluorescing in the blue-violet. Dan elevator into the floor, vivid blue washing up its sides. in eerie silence. It reached the ceiling and kept going. Dan gritted Then he was emerging into a spacious kitchen. A blue-haloed cook waddled to a luminous refrigerator, caught sight of Dan rising slowly inch above the floor. As far as Dan could tell, he hadn't traveled so black. They looked, Dan decided, like ordinary circuit-breaker type another second she would see him, and give the alarm—and Dan needed the wall with a flurry of vivid blue light. Dan pushed the lever over eighteen, Dan thought—as nearly as he could tell with the blue racquet in her left hand and an apple in her right. Her back to Dan and Dan blinked at the flash of blue and looked down. He was hovering Dan jabbed at a lever. The cage shot back through the wall. He was in a filled with glowing blue plants— With a sudden lurch that threw Dan against the steel bars, the approaching with frightful speed. A tall office building reared up fifteen stories high. He was headed dead for it— He covered his ears, braced himself— Dan sank to the floor of the cage, breathing hard. There was a loud With a lunge, Dan scrambled out of the cage. He stood looking around at happen to be aboard the carrier, by the way?" "I just wanted—I mean, after I figured out—that is, the police ... I went for help," Dan finished lamely. "Time machine?" The brown eyes blinked alternately. "I fear some confusion exists. I don't quite dig the significance of the term." "That thing," Dan jabbed a thumb toward the cage. "The machine I came here in. You want me—" "Time machine," the voice repeated. "Some sort of chronometer, perhaps?" "Huh?" time machine?" "Well, it's what you use to travel through time." The brown eyes blinked in agitated alternation. "Apparently I've loused spinning my wheels collecting primitive 2-D art!" "But—don't you have a time machine? I mean, isn't that one?" "That? That's merely a carrier. Now tell me more about your time machines. A fascinating concept! My superiors will be delighted at this development—and astonished as well. They regard this planet as Endsville." following Dan's glance. One of the eighteen fingers touched a six-inch yellow cylinder lying on the desk. "Until the carrier is fueled, I'm afraid it's quite useless. But, to put you in the picture, I'd best introduce myself and explain my mission here. I'm Blote, Trader Fourth "But the way Manny and Fiorello came sailing in through the wall! That has to be a time machine they were riding in. Nothing else could just materialize out of thin air like that." make a deal with you, Dan. You'll secure a small time machine in good " I'm you with a time machine?" "Ah, let me see," Dan temporized. "Time machine. Time machine—" Silently, Blote produced a dog-eared directory. Dan opened it. "That won't be necessary, Dan," Blote said. "I'll accompany you." He the carrier, patted the seat beside him with a wide hand. "Come, Dan. Hesitantly, Dan moved to the carrier. The bluff was all right up to a way." Blote worked levers. The carrier shot out into a ghostly afternoon sky. Faint outlines of buildings, like faded negatives, spread below. Dan looked around, spotted lettering on a square five-story structure. "Over there," he said. Blote directed the machine as it swooped Dan dropped the carrier through the roof, passed down through a dimly The cage descended steadily. Dan peered out, searching for identifying "That's right," Dan said, staring through the haziness. "This is where figures loomed beside the cage. Dan cut the switch. If he'd guessed to regain the carrier as Manny and Fiorello closed in. Dan hauled at a Dan slumped back against the seat with a sigh. Now that he was in the the carrier, then— A low growling was coming from somewhere, rising in pitch and volume. The sound rose higher, into a penetrating wail. There was no sign of mechanical trouble. The carrier glided on, swooping now over a nebulous landscape of trees and houses. Dan covered his ears against the deafening shriek, like all the police sirens in town blaring at once. If the carrier stopped it would be a long fall from here. Dan worked the controls, dropping toward the distant earth. The noise seemed to lessen, descending the scale. Dan slowed, brought Dan stepped from the carrier and looked around. Whatever the noise hadn't it gone into action earlier? Dan took a deep breath. Sound or no exploding. Dan stared from the seat at an iridescent rectangle which hung suspended near the carrier. Its surface rippled, faded to blankness. In a swirl of frosty air, a tall figure dressed in a Dan gaped at the small rounded head, the dark-skinned long-nosed face, red-brown hair, the strange long-heeled feet in soft boots. A neat "That siren," Dan said. "Was that you?"

<question>:
What was the blue spectral vehicle Dan acquired?

<options>:
A A time machine.
B A UFO.
C An inter-dimensional cage.
D A flying car.

<answer>:

C