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 enemy was friendly enough. "I can see it," he said. "It's getting redder. It's ... it's ... melting, yes. Melting down at the bottom a little. Now it's falling over to one side and laying on the air tank. The air tank is getting red, too. I'm afraid ... it's weakening it.... Redder. Oh, oh." General Finogenov notified Major Winship that the underground blast was Gagarin. "Will you please request the general to keep us informed on "Is Pinov," came the reply. "Help?" ," said Major Winship, exhausting his Russian. "Count down. emergency watch this morning," he explained to the other Americans. Americans. "How are we going to know when it's over?" for several minutes. "Ah, it's all Russian. Jabbering away. I can't "Let's all go in," said the fourth American, Capt. Lawler. "It's "Is Pinov. Help?" "Tell him, 'Help'," said Capt. Wilkins, "so he'll get somebody we can "The shot probably went off an hour ago." "The static level hasn't gone up much, if at all." "Maybe," Lt. Chandler said, "it's buried too deep." "Maybe so," Major Winship said. "But we can't have the dome fall down "Is Pinov," came the supremely relaxed voice. "Help?" Americans: "Our comrades seem unconcerned." He peeled back a marker and let it fall. Air currents whisked it away and plastered it against a riveted seam of the dome. It pulsed as though it were breathing and then it ruptured. Major Winship moved quickly to cut out the emergency air supply which on your right side, midway up. I'll try to sheet it." He moved for the plastic sheeting. "We've lost about three feet of calk out here," Capt. Lawler said. "I can see more ripping loose. You're losing pressure fast at this rate." Major Winship pressed the sheeting over the leak. "How's that?" "Not yet." "I don't think I've got enough pressure left to hold it, now. It's sprung a little, and I can't get it to conform over the rivet heads." "This is Major Winship." "Oh! Excellent, very good. Any damage, Major?" "Little leak. You?" "Came through without damage." General Finogenov paused a moment. When no comment was forthcoming, he continued: "Perhaps we built a bit more repeatedly assuring you there was no danger of a quake—and then to "Just leave us alone, thank you," Major Winship said and cut off the "I'll be damned surprised," Major Winship said, "if they got any seismic data out of that shot.... Well, to hell with them, let's get this leak fixed. Skip, can you get the calking compound?" "Larry, where's the inventory?" "Les has got it." "Skip, help look." wall. He traced the leak with a metallic finger. "How does this stuff work?" Capt. Lawler asked. They huddled over the instruction sheet. "Let's see. Squeeze the tube until the diaphragm at the nozzle ruptures. Extrude paste into seam. Allow to harden one hour before service." Major Winship said dryly, "Never mind. I notice it hardens on contact "How do they possibly think—?" "Gentlemen! It doesn't make any difference," Lt. Chandler said. "Some air must already have leaked into this one. It's hard as a rock. A gorilla couldn't extrude it." "Who was supposed to check?" demanded Capt. Wilkins in exasperation. "The only way you can check is to extrude it," Lt. Chandler said, "and if it does extrude, you've ruined it." help." "So do I, Larry. Shouldn't be more than a couple of hours. Unless something else goes wrong." "As long as they'll loan us the calking compound," Capt. Wilkins said. "Yeah, yeah," Major Winship said. cursed twice during the operation. "I'd hate to live in this thing for any period." "I think these suits are one thing we've got over the Russians," Major Capt. Wilkins raised eyebrows. "What brought this on?" After a moment, Major Winship said bitterly, "To hell with the Russian American moonbase." "Is everything all right?" Soviet Union fired an underground atomic device for the being inserted. Another tap indicated it was seated. Major Winship flicked the appropriate chest button and nodded in appreciation. "However," he continued, "we did experience a minor leak in the dome, which is presently being repaired." "The Soviet Union," came the reply, "has reported the disturbance and A new voice came on. "We tried to contact you earlier, Major. We will be able to deliver replacements in about ten days." "I will forward a coded report on the occurrence," Major Winship said. "Let us hear from you again in ... about three hours. Is the leak repaired?" "The leak has not yet been repaired. Over and out." He nodded to Capt. Wilkins and leaned back. Methodically, Capt. Wilkins set about disconnecting the major from the "I could see myself asking them to ask the Russians to ask Finogenov to get on the emergency channel to ask you to charge the air bottle. that was rough." III Capt. Lawler and Lt. Chandler returned with the calking compound. It occupied the rear section of the land car. Lt. Chandler sat atop it. It was a fifty-five gallon drum. ?" asked Major Winship, squinting out into the glaring sunlight. "That," said Capt. Lawler, "is the calking compound." "You're kidding," said Capt. Wilkins. "I am not kidding." of calking compound. Those people are insane." "The question is," Capt. Lawler said, "'How are we going to mix it?' It's supposed to be mixed thoroughly." back the drum out." Reluctantly, they backed the drum out and deposited it. With the aid of Capt. Lawler, Lt. Chandler got the table unstuck. They passed it over to Major Winship, who handed it out to Capt. Wilkins. Captain Wilkins carried it around the drum of calking compound and set it down. It rested uneasily on the uneven surface. Eventually, they accomplished the moving. They wedged the drum between the main air-supply tank and the transmitter. They were all perspiring. "With my reefer out," said Major Winship, "I'm the one it's rough on." He shook perspiration out of his eyes. "They should figure a way to get a mop in here, or a towel, or a sponge, or something. I'll bet you've forgotten how much sweat stings in the eyes." "It's the salt." "Want to bet Finogenov hasn't got a bushel of them?" "No!" Major Winship snapped. With the drum of calking compound inside, both Capt. Lawler and Lt. Chandler retreated to the bunks. Capt. Wilkins maneuvered the mixing attachment. "I feel crowded," he said. "Now what, Skip? The instructions aren't in English." "You're supposed to dump the bucket of stuff in. Then clean the area thoroughly around the leak." "With what?" asked Major Winship. "Sandpaper, I guess." plastic." "Let's come back to how we're going to clean around the leak," Major Winship said. harder than a rock! It is an epoxy! Let's get out of here."

<question>:
Why do the Americans need to ask the Russians for help?

<options>:
A They don't understand the instructions for the compound.
B They need help fixing the leak. They don't know how to use the calking compound.
C They need more manpower to help fix the rest of the dome.
D They need more calking compound to fix the leak. All of what they had has already hardened.

<answer>:

D