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

<passage>:
Earth was so far away that it wasn't visible. Even the vast distance did not mean that isolation could endure forever. Instruments within the ship intercepted radio broadcasts and, within the hour, early TV signals. Machines compiled dictionaries and grammars and began translating the major languages. The history of the planet was tabulated as facts became available. it was not much out of the way to swing nearer Earth. For days the two within the ship listened and watched with little comment. They had to decide soon. "We've got to make or break," said the first alien. "You know what I'm in favor "I can guess," said Ethaniel, who had spoken first. "The place is a complete mess. They've never done anything except fight each other—and invent better weapons." "It's not what they've done," said Bal, the second alien. "It's what they're going to do, with "The more reason for stopping," said Ethaniel. "The big bomb can destroy them. Without our help they may do just that." their problems? They've had two world wars in one generation and that the third and final one in everything they do." "It won't take much," said Ethaniel. "The wrong diplomatic move, or a trigger-happy soldier have to be deliberate. A meteor shower could pass over and their clumsy instruments could interpret it as an all-out enemy just have to forget there ever was such a planet as Earth." "Could you? Forget so many people?" give them a little time and they won't be here to remind me that he said at last. "A bit shorter perhaps, and most certainly incomplete. Except for the one thing they lack, and that's quite odd, they seem exactly like to say?" "It is. The fact that they are an incomplete version of ourselves touches me. They actually seem defenseless, though I suppose they're not." we can do about it." "There is. We can give them their entire history. We can't begin to undo the effect of the big bomb." "You can't tell," said Ethaniel. authority do we have?" "Very little," conceded Ethaniel. "Two minor officials on the nothing in this region of space our people want," said Ethaniel. "And how long can Earth last? Ten years? Even ten months? ourselves by looking." Earth, not intending to commit themselves. For a day they circled the planet, avoiding radar detection, which for them was not difficult, testing, and sampling. "Well, we knew they had the big bomb. Atmospheric analysis showed that as far away as we "I know." "We also knew they could deliver the big bomb, presumably by some sort of aircraft." "That was almost a certainty. They'd have no use for the big bomb without aircraft." "What's worse is that I now find they also have missiles, range one thousand miles and upward. They either have or are to hit them. Nervousness could set it off." "It could, and the missiles did you find out at your end?" were investigating their weapons." "I wish I knew what to think. There's so little time," Ethaniel said. "Language isn't the difficulty. Our machines translate their languages easily and I've taken a cram course in two or three of them. But that's not listening to advertisements, music, and news bulletins. I should go down and live among them, read books, talk to scholars, work with them, play." "You could do that and you'd really get to know them. But "A flat yes or no," said Bal. "No. We can't help them," said Ethaniel. "There is nothing we can do for them—but we have to try." "Sure, I knew it before we before. We take the trouble to find out what a people are like and when we can't help them we feel bad. It's going to be that Earth. They no longer needed instruments to see it. The planet revolved outside the visionports. coursed with rivers the oceans "Nor I," said Bal. "We're going to have to go down there cold. And it will be cold." "Yes. It's their winter." beings?" "Hardly," said Ethaniel. "A hundred years ago it might have worked. Today they have satellites. They are not primitives." "I suppose you're right," said Bal. "I did think we ought to differences." "If we could I'd be all for it. But these people are rough and desperate. They wouldn't be other. We'll tell them bluntly what they'll have to do if they're going to survive, how they can keep their planet in one piece so they can live on it." "That'll go over big. Advice is "Can't help it. That's all we have time for." "Special instructions?" "None. We leave the ship here and go down in separate landing craft. You can talk with me any time you want to through our communications, but don't unless you have to." "They can't intercept the beams we use." "They can't, and even if they did they wouldn't know what to do with our language. I want them to think that we don't need to talk things over." "I get it. Makes us seem better than we are. They think we know exactly what we're doing even though we don't." "If we're lucky they'll think the planet below. "It's going to Sure we don't want to change "I'm afraid not. The great are the ones we have to reach to We'll be running straight into it. That won't help us any." "I know, they don't like their holidays interrupted. It can't be helped. We can't wait until it's I ought to know. Probably learn anything exact from radio and TV. Now it seems to be the people, and they're hard to pin down." and leave the ship up here with no one in it." "They can't touch it. No matter how they develop in the next hundred years they still won't be able to get in or damage it in any way." "It's myself I'm thinking about. Down there, alone." "I'll be with you. On the other side of the Earth." in the ship to bring it down in a hurry if things get rough. They don't think much of each other. I don't imagine they'll like aliens any better." "They may be unfriendly," the ship against the sun "They can't imagine that we'd light up an unmanned ship," said Ethaniel. "Even if the thought should occur to them they'll have no way of checking it. Also, they won't be eager to harm us with "Don't spare power." Earth will see it." Later, with the be just the help we need." "It's not we who need help, but the people of Earth," said Ethaniel. "See you in five days." With of the planet. Earth, unmanned, blazing and pulsing with light. No star in the winter skies of the planet below could equal it in brilliancy. Once a man-made satellite came near but it was dim and was lost sight Earth to illuminate it. Never, or seldom, had Earth seen anything like it. up from Earth and joined the small craft slid inside the large one and doors closed behind them. In a short time the aliens met again. how we did it and I thought we were going to fail but at the last "It did. I don't know why, but it did," said Bal. "Anyway, this agreement they made isn't the best but I think it will keep them from destroying themselves." "It's as much as we can expect," said Ethaniel. "They may "Why?" their paintings they had pictured him innumerable times. so myself occasionally." "But you don't know what an angel is?" "No. I didn't have time to find out. Some creature of their folklore I suppose. You know, except for our wings they're very much like ourselves. Their legends are bound to resemble ours." "Sure," said Bal. "Anyway,

<question>:
Why are the aliens not sure if they can help the humans?

<options>:
A Their superiors would not approve of an intervention on this planet
B They do not think they have enough time to intervene like they wish they could
C They do not have experience with this specific type of military technology
D They have no way of communicating with the humans in their own languages

<answer>:

B