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

<passage>:
Antlers Park, the manager of I. V. himself. "What's the Baldric?" I had asked. Antlers Park flicked the ash from his cheroot and shrugged. "Will you believe me, sir," he said, "when I tell you I've been out it didn't make sense. "However, as you perhaps know, the only reason for colonial activities here at all is because of the presence of an ore known as Acoustix. It's no use to the people of Earth but of untold value on Mars. I'm not up on the scientific reasons, but it seems that life on the red middle age, his ability to produce those vibrations steadily decreases. Then it was found that this ore, Acoustix, revitalized their sounding apparatus, and the rush was on." "What do you mean?" Park leaned back. "The rush to find more of the ore," he explained. "What sort of trouble?" Grannie Annie had demanded. And when Antlers party of four persons. In the lead was a little old lady in a black dress. Behind her strode a grizzled Earth man in a flop-brimmed hat, has been bewitched," he began slowly. "We pay our men high wages and give them "They walk out into the Baldric," he continued, "and nothing can stop them. We tried following them, of course, but it was no go. As soon as perched upon it. They watched us with their mild eyes as we passed, but Baker dropped his cigarette and ground his heel on it savagely. "Shaft Four, eh?" he repeated. "That's our principal mine. If the fever spreads there, I'm licked." "There must be ways of stopping this," she said. "Have you called in any physicians? Why don't you call an enforced vacation and send the men away until the plague has died down?" threw off the switch. "The entire crew of Shaft Four have gone out into the Baldric," he said slowly. There was a large map hanging on the wall back of Baker's desk. Baker looked up. "That's right. We only began operations there a comparatively short time ago. Struck a rich vein of Acoustix that runs deep in. If that vein holds out, we'll double the output of level where a huge laboratory and experimental shop ran the length of the building. Grannie seized a light weight carry-case and began , and through glass doors I could see clerks busy with counting machines and report tapes. In another chamber the extremely light Acoustix ore was being packed into big cases and marked for shipment. At the far end a door to a small room stood open. Inside a young man was tilted back in Antlers Park flashed on the screen. Miss Flowers there?" "Miss Flowers left with Mr. Baker for Shaft Four," I said. "There's trouble up there. Red spot fever." "Fever, eh?" repeated Park. "That's a shame. Is there anything I can "A little. But up until yesterday the fever's been confined to the other side of the Baldric. We had one partial case, but my chemists gave the chap an antitoxin that seems to have worked. Come to think of it, I might drive over to Shaft Four and give Jimmy Baker the formula. I haven't been out in the Baldric for years, but if you didn't have any trouble, I shouldn't either." well camp beside it." Moments later a rude circle of flagpole trees loomed ahead. Across the of the car and began making camp. Xartal remained in his seat. He was "Don't you see," the lady continued. "Everything that Xartal put on paper has been seen by one or more of these cockatoos. The cockatoos "Sorry," the operator said. "I've used too much power already. Have to give the generators a chance to build it up again." Nodding, I turned and motioned to Karn. We went back downstairs. "That explains something at any rate," the old prospector said. "But how about that Red spot fever?" On Jimmy Baker's desk was a large file marked: FEVER VICTIMS. I opened it and found it contained the case histories of those men who had been received the first symptoms, not while working in the mines, but while sleeping or lounging in the barracks. Five minutes later Karn and I were striding down a white ramp that led to the nearest barracks. The building came into sight, a low part of the button appeared to be a powerful lens of some kind, and as I seized it and pulled it loose, I felt the hum of tiny clock work. All at once I had it! Red spot fever. Heat fever from the infra-red rays of Jupiter's great spot. Someone had constructed this lens to served a double purpose. It opened a shutter, and it rotated the lens slowly so that it played for a time on each of the sleeping men. I slid the metal button in my pocket and left the barracks at a run. controls was Antlers Park, the manager of Interstellar Voice. getting sick of this blamed moon." It didn't make sense. In all the years I'd known Annabella C. Flowers, never yet had I seen her desert a case until she had woven the clues and facts to a logical conclusion. prim way next to Antlers Park. Park said: He waved his hand, and the car moved off. I watched it as it sped across the desert, and a growing suspicion began to form in my mind. Then, like a knife thrust, the truth struck me. "Ezra!" I yelled, swinging the car. "That wasn't Grannie! That was one in his hand. There was a flash of purple flame, and a round hole appeared in our windscreen inches above Karn's head. speed, I raced alongside. The I. V. manager lifted his weapon frantically. But before he could use it a third time, Ezra Karn had whipped a lariat from his belt and sent it coiling across the intervening space. The thong yanked tight about the manager's throat. Park did the only themselves in a long flanking corridor in a northwesterly direction, as if to hide some secret that lay beyond. Twice I attempted to penetrate "I see you've got Antlers Park. I'm glad of that. It saves me a lot of trouble." She took off her spectacles and wiped them on her sleeve. "Don't look so fuddled, Billy-boy. Come along, and I'll show you." had been removed, and mounted on the hood was a large bullet-like contrivance that looked not unlike a search lamp. A blinding shaft of vibratory scale and the only thing that will combat the infra-red rays that cause red spot fever. Those men won't stop walking until they've reached Shaft Four." Grannie Annie told her story during the long ride back to Shaft Four. We drove slowly, keeping the line of marching Larynx miners always ahead of us. Jimmy Baker had struck a new big lode of Acoustix, a lode which if worked successfully would see Larynx Incorporated . Antlers Park didn't want that. It was he or his agents who placed those lens buttons in the Larynx barracks. capable when its rays were concentrated of causing a fatal sickness. Then suddenly becoming fearful of Grannie's prying, Antlers Park strove to head her off before she reached Shaft Four. He did head her off and managed to lure her and Baker and Xartal into the Shaft barracks where they would be exposed to the rays from the lens button. But Grannie only pretended to contract the plague. Park then attempted to outwit Ezra Karn and me by returning in Jimmy Baker's kite car with a cockatoo image of Grannie.

<question>:
What main motivation did Antler Park have to leave the lens in the barracks?

<options>:
A He didn't fully understand the effects of the infra-red rays and wanted to see what it was capable of.
B He knew the value of this spot for Acoustix, and wanted to run the Jimmy Baker out.
C He was afraid of Grannie Annie discovering his plot and tried to get rid of her.
D He had struck a large load of Acoustix and wanted to hide the evidence.

<answer>:

B