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

<passage>:
Captain Hannah climbed painfully down from the to take care of it—kept us apart until we both cooled down a little. among the stars. Call it the Look of Eagles. Captain Hannah had lost more of the ubiquitous swellings. I figured that he figured that I had something to do with the way he I only drink rhial when I've been exposed to Captain Hannah. It was having him take the therapy. "A He lapsed back into silence after this uncharacteristic admission. I the field with her two-ton infant in tow, to show her off to Hannah. I us. The fruit of the marocca is delicious and fabulously expensive. "I got them there safely," said Captain Hannah. "When I left, marocca was growing like mad," said Captain Hannah. that marocca takes a very special kind of environment. Bright sun most of the time—that means an almost cloudless environment. A very equable climate. Days and nights the same length and no seasons—that means no ecliptical and no axial tilt. But our tests showed that the plants had enough tolerance to cause no trouble in the trip in Delta Crucis ." A "Your tests were no good," agreed the captain with feeling. "I'll tell "You'll remember that I warned you that we should take some marocca ourselves to hauling a full load of it?" asked Captain Hannah. we had gone through all of that rigamarole, we would have lost the franchise. Besides, they gave you full written instructions about what to do under all possible circumstances." "Sure. Written in Myporian. A very difficult language to translate. , but I figured it was safer to let him tell me in his trouble. The plastic film kept the water in the hydroponic tanks without any trouble, even in a no-gravity condition. And by the time I had lined up for Gloryanna and Jumped, I figured, like you said, that the trip would be a cakewalk. "Do you remember how the plants always keep their leaves facing the sun? They twist on their stems all day, and then they go on twisting them all night, still pointing at the underground sun, so that they're aimed right at sunrise. So the stem looks like a corkscrew?" I nodded. "Sure. That's why they can't stand an axial tilt. They 'remember' the rate and direction of movement, and keep it up during the night time. So what? We had that problem all figured out." "You think so? That solution was one of yours, too, wasn't it?" He gazed moodily at his beaker of rhial. "I must admit it sounded good to me, too. In Limbo, moving at multiple light-speeds, the whole Universe, of course, turns into a bright glowing spot in our direction of motion, with everything else dark. So I lined up the Delta Crucis darkness. "Of course, it didn't work." "For Heaven's sake, why not?" moving?" "So what did you do?" I asked, when that had sunk in. "If the stem doesn't keep winding, the plants die and they can only take a few extra hours of night time before they run down." "Oh," said Captain Hannah in quiet tones of controlled desperation, "it was very simple. I just put enough spin on the ship to make artificial The plants liked it fine. "Of course, first I had to move all the hydroponic tanks from their the southern hemisphere, it turned out that half of the plants had a sinistral corkscrew and the other half had a dextral. So I had to set the plants up in two different rooms, and run an artificial sun for each, going clockwise with one, widdershins with the other. "I won't even talk about what I went through while I was shifting the hydroponic tanks, when all the plastic membranes that were supposed to keep the water in place started to break." He stared at me in silence for a moment. "Well, it filled the cabin with great solid bubbles of water. Water bubbles will oscillate and wobble like soap bubbles," he went on dreamily, "but of course, they're not empty, like soap bubbles. The surface acts a little like a membrane, so that sometimes two of the things will touch and gently bounce apart without joining. But just try touching one of them. You a wide cylinder with a piston with a handle, and a hose that you squirt the water out of, or can suck water in with. The way you use it is, you float up on a big ball of water, with the pump piston down—closed. You carefully poke the end of the hose into the ball of water, letting only the metal It was full of minerals and manure and such, and I didn't want to introduce it into the ship's tanks." "But you solved the problem?" He shrugged. "I couldn't say. By that time I was ignoring them. It was that or suicide. I had begun to get the feeling that they were stalking me. So I drew a blank." "Then after that you were all right, except for the tedium of moving "Not yet," said Captain Hannah. "Like you, I figured I had the larval stage. Instead of making cocoons for themselves, they snipped habits. And now they were mature. "There were thousands and thousands of them, and each one of them made cloud—by spreading it all through the ship—or whether to try to block off the other plant room, and save it at least. So I ended up by not correct word is carolla—are a necessary part of the life cycle of the marocca. The larvae provide an enzyme without which the plants die. while the midges died one by one. It was heartbreaking—at least, it fill itself full to bursting before it will reproduce. If I had the translation done correctly, they were supposed to dart gracefully capturing her prey by sound alone. "So I spent the whole day—along with my usual chore of shifting the who is captain of his own ship." I must say that I agreed with him, but it seemed to be a good time for immediately got busy opening small buds on the stems of the marocca phase of the marocca plants. Did you know that they plant marocca "The book says that it takes just six hours for a marocca field to one plant twining with another as they climbed toward the light. it wouldn't do its job right. In effect, their growth would put out the sun. one of the things they do is to defend the marocca against marauders. "And what's more, I found that I couldn't kill the damn things. Not if I wanted to save the plants. The growth only stops at the end of six "It turns out that it's all right to cut marocca as soon as it stops growing. To keep the plants from dying, though, you have to mulch the cuttings and then feed them back to the plants, where the roots store whatever they need against the time of the next explosive period of translated very carefully—it required an 'organic processor'. process it the hard way. "I didn't even have time to scratch my bites. I must have lost weight and answered them, so I had to do a good deal of backtracking before I could get into parking orbit around the planet, and then set Delta Crucis behaved like a lady. "I hadn't chopped off all of the new growth, although I had the plants formed fruit, and the fruit had ripened and dried, and the seeds had developed fully. They were popping and spreading fine dust-like spores reasonable at the time." Captain Hannah inhaled a sip of rhial, and "Well, go on," I urged him. "The marocca plants were still in good Hannah nodded. "They were growing luxuriously." He nodded his head a Delta Crucis as security to "They'll send you the bill. They don't figure it will take them more than a few months to complete the job." Captain Hannah stopped talking and stood up, painfully and a little

<question>:
What best describes the overall structure of Captain Hannah's dialogue when recounting his time caring for the marocca plants?

<options>:
A An argument and supporting details along with counterclaims structure.
B A catchphrase followed by explanations structure.
C A purpose and explanation structure.
D A problem-solution structure.

<answer>:

D