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

<passage>:
luck had run its course, and now he was marooned on a rogue planet—fighting to save himself from a menace weapons could not kill. in Dennis' mind True, Koerber's escape from the I.S.P. net had not quite been his fault It cost a young fortune. But to pleasure mad, boom-ridden Venus, a fortune was a bagatelle. Only it had cost Dennis Brooke far more than a sheaf of credits—it had cost him the severe rebuff of the I.S.P., and most of his heart in Marla. Dennis couldn't tell. But his senses became instantly alert. Danger side as he leaped with deadly intent on the sprawled figure of Dennis cried out. Then the Martian's hand reached out hungrily. But Dennis was Leaping to one side, impervious to the fall of the dancer, he avoided the murderous rush of the Martian youth, then he wheeled swiftly and planted a sledge-hammer blow in that most vulnerable spot of all The Martian's violet eyes were black with fury now. He staggered back and sucked in air, his face contorted with excruciating pain. But he was not through. His powerful right shot like a blast straight for Dennis, breathing heavily, stood over him until the international Brooke!" The Police Lieutenant favored Dennis with a wry smile. "If Who else could afford to risk his neck at the International, and have in his possession a disintegrator? Pity we have no complete records "Better come to Headquarters with me, Dennis," the lieutenant said "Sit down, Dennis. I've sent for you, despite your grounding, for "somewhere between Venus and Terra, the interplanetary spacer bringing her and several other passengers, began to send distress signals. begetting! Let me try, and I promise you ..." in his torture, Dennis was unconsciously banging a knotted fist on the chaste, satiny surface of the priceless desk, "I promise you that I will either bring you Koerber, or forfeit my life!" Commander Bertram nodded his head. "I brought you here for that purpose, son. We have reached a point in our war with Koerber, where the last stakes must be played ... and the last stake is death!" in space. This, Dennis," the Commander emphasized his words, "is your side. Tiny on the viso-screen, the fatal spots must have been huge in actuality. To the Commander of the I.S.P., and to Captain Brooke, it was an old story. Atom-blasts were pitting the spacer's hull with deadly Genton shells. The great transport trembled under the impact of the barrage, and suddenly, the screen went blank. "When do I leave, Commander!" Dennis Brooke's voice was like a javelin To all but Captain Brooke, this was a new adventure, their first assignment to duty in a search that went beyond the realm of the inner planets, where men spent sleepless nights in eternal vigilance against stray asteroids and outlaw crews of ruthless vandal ships. Even their cruiser was a new experience, the long, tapering fighter lacked thing of beauty, but of grim, sleek beauty instinct with power, not the comfortable luxury that they knew. Day after day they went through their drills, donning space suits, manning battle stations aiming deadly atom-cannon at empty space, and eternally scanning the vast empty reaches by means of the telecast. "Prepare to board!" Every member of the crew wanted to be among the boarding party, for were to go beside himself: "You, Tom and Scotty, take one emergency plane, and Dallas!" survey. "No doubt about it," he spoke through the radio in his helmet. "Cargo missing. No survivors. No indication that the repulsion fields were out of order. And finally, those Genton shells could only have been fired by Koerber!" He tried to maintain a calm exterior, but inwardly he seethed in a cold fury more deadly than any he had ever experienced. Somehow he had expected to find at least one compartment unharmed, where life might have endured, but now, all hope was gone. Only a great resolve to deal with Koerber once and for all remained to him. Dennis tried not to think of Marla, too great an ache was involved in thinking of her and all he had lost. When he finally spoke, his voice was harsh, laconic: "Prepare to return!" major battle, or hell and high water and back again, for that matter, shifted the Venusian weed that made a perpetual bulge on his cheek and gazed curiously at Captain Brooke. They all knew the story in various in their loyalty, and with Dennis Brooke they could and did feel safe. dangerous asteroid belt, where even planetoids drifted in eccentric uncharted orbits. Dennis, Tom Jeffery and Scotty Byrnes raced to the control room, member of the crew raced to his assigned task without delay. Action impended, and after days and nights of inertia, it was a blessed unmistakably for what it was—a pirate craft, it showed by its sudden maneuver that it had detected the I.S.P. cruiser. For it had described a parabola in space and headed for the dangerous asteroid belt. As if navigated by a masterly hand that knew each and every orbit of the asteroids, it plunged directly into the asteroid drift, hoping to lose the I.S.P. cruiser with such a maneuver. Ordinarily, it would have succeeded, no I.S.P. patrol ship would have dared to venture into such a trap without specific orders. But to Dennis Brooke, directing the chase from the control room, even certain death was welcome, if only he could take Koerber with him. Weaving through the deadly belt for several hours, Dennis saw his mortally wounded. Then Dennis maneuvered his cruiser into a power ripped, second armor penetrated and the magnificent vessel shook under the detonating impact. It was then that Dennis Brooke saw the immense dark shadow looming desperately in an effort to break the gravity trap of the looming mass, but too late. It struggled like a fly caught in a spider-web to no avail. It was then that Koerber played his last card. Sensing he was doomed, he tried to draw the I.S.P. Cruiser down with him. A powerful magnetic beam lashed out to spear the I.S.P. Cruiser. With a wrenching turn that almost threw them out of control, Dennis was supposed to have existed between Jupiter and Mars. Only that could possibly explain the incredible gravity. And then began another type of battle. Hearing the Captain's orders to a crash. Far in the distance they could see Koerber's ship preceding them in a free fall, then the Planetoid was rushing up to engulf them. was anything but reassuring. Towering crags jutted raggedly against the sky, and the iridescent soil of the narrow valley that walled in the cruiser, had a poisonous, deadly look. As far as their eyes could reach, the desolate, denuded vista stretched to the horizon. the forward fuel chambers and the armor had blossomed out like flower petals. The crash-landing had not helped either. "But, you may as well know it," Scotty replied quietly. "That parting shot of Koerber's severed our main rocket feed. I had to use the emergency tank to make it down here!" For a long moment the four men looked at each other in silence. Dennis contemptuous remark voiced the feelings of the entire crew. A man who failed to be at his battle-station in time of emergency, had no place in the I.S.P. "Considering the gravity of this planetoid," Dennis Brooke said thoughtfully, "it's going to take some blast to get us off!" "Maybe we can locate a deposit of anerioum or uranium or something for "Better break out those repair plates," Dennis said to Scotty. "Tom,

<question>:
Why was Dennis sent on the mission even though he was grounded?

<options>:
A They wanted Koerber brought back alive
B His grounding had been done in error
C He was sent by mistake
D The mission was likely to be deadly

<answer>:

D