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

<passage>:
The Blue Behemoth By LEIGH BRACKETT Shannon's Imperial Circus was a jinxed Buckhalter Shannon's Imperial Circus to Buckhalter Shannon's face unless he's tired and wants a long rest in a comfy fracture-frame. Shannon got up. He got up slowly. I had plenty of time to see his slanting cat-eyes of the little dark people at the tables swing round toward us, pleased and kind of hungry. I had plenty of time to think how I only weigh one-thirty-seven to Shannon's one-seventy-five, and how I'm not as young as I used to be. I said, "Bucky. Hold on, fella. I...." he was a lousy bill-collecter and I felt sorry for him. Bucky Shannon settled his shoulders and hips like a dancer. quivering and showing their teeth. The Martian girl screamed. Bucky heaved the table off his lap and cursed me. "What's eating you, Jig? I'm not going to hurt him." "Shut up," I said. "Look what he's got there. Money!" stayed placid and babyish, almost transparent. I realized with a start that it wasn't transparent at all. It was the most complete dead-pan I like hungry cats at a mouse-hole." I looked at Bucky. He looked hungrier than the Marshies did. We didn't scenery—scowling, unapproachable, and tough. His hands, holding the curtains apart, had thick black hair on them and were not much larger than the hams of a Venusian swamp-rhino. cansin . The only other one on the Triangle belongs to Savitt Brothers, and she's much smaller than Gertrude." She was also much younger, but I didn't go into that. Gertrude may be a little creaky, but she's still pretty impressive. I only hoped she wouldn't die on us, because without her we'd have a sicker-looking circus than even I could stand. Beamish looked impressed. "A is a fascinating subject. The extreme rarity of the animal...." We were getting off the subject. I said tactfully, "We'd have to have at least a hundred U.C.'s." It was twice what we had any right to ask. I was prepared to dicker. We said good night, trying not to drool. Beamish went away. Bucky made It was pretty late when we got back to the broken-down spaceport where Shannon's Imperial Circus was crouching beneath its attachments. Late as it was, they were waiting for us. About twenty of them, sitting around and smoking and looking very ugly. It was awfully lonesome out there, with the desert cold and restless weeks we'd come in at the front door. The news was all over the ship before we got inside. The freaks and the green girl from Tethys who could roll herself like a hoop, and Zurt the muscle man from Jupiter, and all the other assorted geeks and kinkers Bucky was looking stubborn, so I shrugged. Our footsteps sounded loud and empty on the iron floor. I wasn't around them as strong as the cage bars. Bucky Shannon lurched against me suddenly. I choked back a yell, and worse," he said. "She's lonesome." "That's tough," said Bucky Shannon. His grey-green eyes looked like an . There's only two of them on the Triangle. If you haven't, nothing I can say will make much difference. I wouldn't know, of course, but Gertrude looks to me like she got stuck some place between a dinosaur and a grizzly bear, with maybe a little bird blood thrown in. Anyway, she's big. I couldn't help feeling sorry for her. She was crouched in the cage with her hands—yeah, hands—hanging over her knees and her snaky head sunk into her shoulders, looking out. Just looking. Not at anything. mane, or crest, of coarse wide scales that ran from between her eyes clear down to her flat, short tail, burn all colors. She looked like old Mother Misery herself, from way back before time began. looking out over the tank, sniffing a little, like a hound. Then he and everybody thought she was too hurt to live, I saved her. I know her. I can do things with her. But this time...." He shrugged. He was huge and tough and ugly, and his voice was like a woman's talking about a sick child. "This time," he said, "I ain't sure." He draped himself over my shoulder and we went off. Gow didn't look at us. Bucky sobbed. "You were right, Jig," he mumbled. "Circus is no good. I know it. But it's all I got. I love it, Jig. Unnerstan' me? Like Gow there with Gertrude. She's ugly and no good, but he loves her. I love...." Bucky was almost asleep on me. I started to slap him. And then the mist roars and shrieks, packed in tight by the metal walls, and above it all I could hear Gertrude's lonely, whistling scream. I thought, " Bucky moaned and kicked under me. I remember hanging on and thinking, Then I went out. II Kanza the Martian croaker, was bending over me when I woke up. His little brown face was crinkled with laughter. He'd lost most of his latch and looked at my feet. "And—uh—Jig, I...." I said, "Skip it. The next time, just don't trip me up, that's all!" and Gow, on the rare occasions he came up for air, went around looking like a disaster hoping to happen. To make it worse, Zurt the Jovian strong-man got hurt during the take-off, and the Mercurian cave-cat had kittens. Nobody would have minded that, only one of 'em had only four legs. It lived just long enough to scare that bunch of superstitious dopes out of their pants. Circus people are funny that way. Shannon and I did a little quiet sleuthing, but it was a waste of time. Anybody in the gang might have let those electric worms out on us. It our router's runabout beside it. Bucky Shannon groaned. "A blue one, Jig. A morgue if I ever saw one!" I snarled, "What do you want, with this lousy dog-and-pony show!" and went out. He followed. The gang was converging on the lock, but they but her blue-green, hard scaled hide, and she was chuckling. It didn't "The deep swamps are angry," she whispered. "Something has been taken. could see him plainly, because he was off to one side of the crowd. He fell on his knees in the mud, making noises. It took him three or four tries to get our names out clear enough to understand. Bucky said, "Jig—it's Sam Kapper." We started to run. The crowd, mostly big unshaken miners, wheeled who crawled and whimpered in the mud. too broke, and we were pretty friendly. I hadn't seen him for three seasons. I remembered him as a bronzed, hard-bitten guy, lean and tough as a twist of tung wire. I felt sick, looking down at him. Bucky started to help him up. Kapper was crying, and he jerked all over "I got it hidden. They want to find out, but I won't tell 'em. It's wouldn't let me, and I was afraid they'd find it...." " Cansin . Male. Only one. You don't know...! Take him back." "Where is it, Sam?" "Yeah," said Bucky. He looked as bad as I felt. "Poor Sam."

<question>:
Why did the crew mind that the cave-cat had kittens?

<options>:
A They didn't perform well while they were small.
B They were too dangerous to keep onboard
C They had no food for more mouths to feed
D One had only four legs

<answer>:

D