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

<passage>:
problems. If you like, we might get the captain of that Patrol ship to legalize the situation by TV." "I can see you're used to sweeping girls off their feet," she commented sourly. "The main problem is whether you can cook." "Just don't try to sucker me in on the deal. I know you're operating something sneaky all through the colony, but it's not for me." , he promised himself, I'll explain how I cut the fuel flow and see if she's detective enough to suspect that we're just orbiting Ganymede! and rugged. The glowing semi-disk of Jupiter was more than half a million miles distant. "Try not to be simple—for once!" growled Jeffers. "A little percentage "Now, listen ! Maybe they live soft back on Earth since the mines and the Jovian satellite colonies grew uniform jacket. He shook his head, grinning resignedly. "You just don't listen to me hazardous duty. How else can you get pilots out to Jupiter?" "Okay I can't fire you legally—as long as you report for work," grumbled Jeffers, by now a shade more ruddy. "We'll see how long you He winked and walked out, deliberately leaving the door open behind him so as to enjoy the incoherent bellowing that followed him. Looks like a little vacation , he thought, unperturbed. He'll come around. I just want to get back to Earth with a clean rep. Let Jeffers and his gang steal the Great Red Spot off Jupiter if they like! It's their risk. "What do you mean?" "They say some home-office relative is coming in on the Javelin ." "What's wrong with that?" asked Tolliver. "Outside of the way they keep handing out soft jobs to nephews, I mean." "Aah, these young punks just come out for a few months so they can go back to Earth making noises like spacemen. Sometimes there's no reason orbit. Wait till you see the baggage you'll have to load!" Later in the day-period, Tolliver recalled this warning. Under a portable, double-chambered plastic dome blown up outside the ship's apparently won from one of the pilots. She wore gray slacks and a heavy sweater, like a spacer. Earth's orbit and landed by pilots who don't have to waste their time making the entire trip." "You never can tell," said the pilot, yielding to temptation. "Any square inch of Ganymede is likely to be dangerous." I'll be sorry later , he reflected, but if Jeffers keeps me jockeying mention volcanic puffballs that pop out through the frozen crust where you'd least expect. That's why I draw such high pay for driving an Mercury, something like 3200 miles in diameter, so things get heaped up at steep angles. When the rock and ice are set to sliding, they come edging the tractor into the airlock at their destination. "Made my pile. No use pushing your luck too far." His charge seemed noticeably subdued, but cleared her throat to request as if with a burden of worry upon her mind, and the pilot's conscience prickled. I'll get hold of her after Jeffers is through and set her straight , he resolved. know better. Remembering his grudge against the manager, he took pleasure in walking in without knocking. enough. "No stupid questions!" Jeffers ordered. "Lock these two up while I think!" in with him. The snapping of a lock was followed by the tramp of departing footsteps and then by silence. The skin under his right eye did feel a trifle tight, but he could see well enough. The abandoned and empty look of the office worried him. "What can we use to get out of here?" he mused. smuggling, or whatever he has going for him here. That's why I want to get out of here—before I find myself involved in some kind of fatal accident!" rumors, and I had a halfway invitation to join in. I think he sells things to the mining colonies and makes a double profit for himself by claiming the stuff lost in transit. You didn't think you scared him that bad over a little slack managing?" discarded records. "Better than nothing at all," he muttered. He ripped out a double handful of the forms, crumpled them into a pile at the doorway, and pulled out his cigarette lighter. heat. If I can kick loose a hinge, maybe we can fool them yet!" He got a little fire going, and fed it judiciously with more papers. "You know," he reflected, "it might be better for you to stay here. He can't do much about you, and you don't have any real proof just by "I think there's a storeroom for spacesuits around here," muttered Tolliver. donning a suit himself. "That switch under your chin," he said, touching helmets so she could hear him. "Leave it turned off. that was standard suit equipment, he deliberately slashed a four-foot square section out of the dome. He motioned to Betty to step through, then trailed along with the plastic under his arm. He caught up and touched helmets again. "Just act as if you're on business," he told her. "For all anyone can see, we might be inspecting the dome." "Where are you going?" asked Betty. "Right through the wall, and then head for the nearest mine. Jeffers can't be running everything From the corner of his eye, he thought he saw Betty make a startled gesture, but he had his work cut out for him. This was tougher than the interior dome. Finally, he managed to saw a ragged slit through which they could squeeze. There was room to walk between the inner and outer layer, so he moved along a few yards. A little dust began to blow about where they had gone through. He touched helmets once more. "This time," he said, "the air will really start to blow, so get through as fast as you can. If I can slap this piece of plastic over the rip, it may stow down the loss of pressure enough to give us quite a lead before the alarms go off." As soon as he plunged the knife into the outer layer, he could see dusty, moist air puffing out into the near-vacuum of Ganymede's surface. Fumbling, he cut as fast as he could and shoved Betty through the small opening. Squeezing through in his turn, he left one arm inside to spread the plastic sheet as best he could. The internal air pressure slapped it against the inside of the dome as if glued, although it immediately showed an alarming tendency to balloon through the ruptured spot. They'll find it, all right , Tolliver reminded himself. Don't be here when they do! He grabbed Betty by the wrist of her spacesuit and headed for the trouble." It was when he looked about to make sure that they were unobserved that "In fact, we have to get in to stay out of trouble," he said to Betty. inside, but he managed. They passed through the airlock, fretting at the time required to seal, pump air and open the inner hatch and then clumsy trip in their spacesuits, but he wanted to save time. glanced at the gauges and showed her how to open her helmet. "Leave the suit on," he ordered, getting in the first word while she was still shaking her head. "It will help a little on the takeoff." "Takeoff!" shrilled Betty. "What do you think you're going to do? I making contact. uniform. "Space Patrol?" whispered Tolliver incredulously. "That's right," said Betty. "Uh ... Daddy made arrangements for me." "Actually, I have a fine idea," he informed the officer coldly. "I happen to be a qualified space pilot. Everything here is under control. If Miss Koslow thinks you should arrest Jeffers, you can call us later "Oh, come on ! Can't they get us back? How can you tell where we're going?"

<question>:
What is the purpose of “touching helmets”?

<options>:
A To communicate without using the radio.
B To share oxygen.
C To maintain the vacuum seal of the suits.
D To keep the dust out.

<answer>:

A