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

<passage>:
Grdznth problem getting to be a PRoblem, need expert icebox salesman to get gators out of hair fast. it'll make much difference to us." Charlie sank slowly down to the desk. He wasn't laughing any more. "We're never going to see any Grdznth babies. It's going to be a little too cold for that. The energy factor," he mumbled. "Nobody thought of aloud and quickly retired behind a newspaper. The creature coughed apologetically. "Terribly sorry," he said in a coarse rumble. "So difficult to control, you know. that the U.S. copyright on this publication was renewed. Minor spelling and typographical errors have been corrected without note. barrier, you know. Frightfully hard to make the jump." He broke off sharply, staring out the window. "Dear me! Are we going rumble rose around him like a wave. He was a Public Relations man to the core—but right now he was off duty. He chuckled to himself, and the passengers avoided him like the hanging him, this time. The lobby of the Public Relations Bureau was swarming like could almost smell the desperate tension of the place. He fought his way past scurrying clerks and preoccupied poll-takers step off the elevator, and ran forward with open arms. "I thought you'd never get here!" he groaned. "When you didn't "Check." "To people who don't want to buy them, right?" The more Grdznth come through, the more they act as though they own the place. Not nasty or anything—it's that infernal politeness that people hate most, I think. Can't get them mad, can't get them into a fight, but they do anything they please, and go anywhere they please, and if the people don't like it, the Grdznth just go right ahead anyway." Tommy gave him a long look. "So far we've kept it out of the papers, but there have been some incidents. Didn't hurt the Grdznth a bit—they have personal protective force fields around them, a little point they didn't bother to tell us about. Anybody who tries anything fancy gets thrown like a bolt of lightning hit him. Rumors are getting wild—people saying they can't be killed, that they're just moving in to stay." in their cultural background makes them stick strictly to their agreements. But that's just what the psych-docs think, and they've been known to be wrong." "And the appointed time?" Tommy spread his hands helplessly. "If we knew, you'd any day now." Pete's eyes widened. "Nova?" "Apparently. Nobody knows how they predicted it, but they that climate, at least not until they've been there long enough to get their glands adjusted. Seems we have just the right climate it just doesn't wash. If the Grdznth are so unpopular with the masses, why did we let them in here in the first place?" He looked narrowly at Tommy. "To be very blunt, what's the parking fee?" see. The fee is so high, Earth just can't afford to lose it. Charlie Karns'll tell you why." box. "It's the parallel universe business, of course," he said to can cross through. They've been able to do it for a long time. According to our figuring, this must involve complete control of mass, space and dimension, all three. And time comes into one of the three—we aren't sure which." spin. "No wires?" " closed the box with a click. "This is one of their children's toys, and theoretically, it can't work. Among other things, it takes "And if you do, then what?" Charlie took a deep breath. "We'll have inter-dimensional which means the greatest advance in power utilization since fire was discovered. It might give us the opening to a concept of time travel that makes some kind of sense. And power! If there's an energy differential of any magnitude—" He shook his head sadly. "We'll also know the time-differential," said Tommy hopefully, "and how long the Grdznth gestation period will be." "It's a fair exchange," said Charlie. "We keep them until the girls have their babies. They teach us the ABC's of space, mass and dimension." cosmetician to the Public Relations men. "I say—I thing we've tried," he added as they moved on down the corridor. "You should see the field reports. We've tried selling the advances Earth will have, the wealth, the power. No dice. The man on the street reads our PR-blasts, and then looks up to see one of the nasty things staring over his shoulder at the newspaper." "Ulcers," said Tommy. "City traffic isn't enough of a mess as it is. And they don't do anything about it. They apologize profusely, but they keep coming through." The two started on for the office. "Things are getting to the breaking point. The people are wearing thin from sheer annoyance—to say nothing of the nightmares the kids are having, and the trouble with women fainting." The signal light on Tommy's desk was flashing scarlet. He icy edge to his voice. "You may not have heard about it yet, but you can take my word for it. I personally will be delighted to make the necessary arrangements, but I doubt if I'll need to. There are at least a hundred senators in Washington who are ready to press for your dismissal, Mr. Heinz—and there's been some off-the-record talk about a lynching. Nothing official, of course." something." "Do something! You think I'm a magician? I can just make them vanish? What do you want me to do?" The senator raised his eyebrows. "You needn't shout, Mr. Heinz. I'm not the least interested in excellent PR-man." off your neck for a while, at least." "Indeed." "Now see here," said the senator. "If you're trying to make The color was back in Tommy's cheeks, and the senator was forgotten as a dozen intercom switches began snapping. "We'll need TV hookups, and plenty of newscast space," he said eagerly. "Maybe a few photographs—do you suppose maybe The planning revealed the mark of genius. Nothing sudden, harsh, or crude—but slowly, in a radio comment here night. Copy rolled by the ream from Tommy's office, refined copy, hypersensitively edited copy, finding its way into the light of day through devious channels. were a trifle overbearing in their insufferable stubborn politeness—but in a civilized world you just In the Public Relations Bureau building, machines worked on into the night. As questionnaires came back, spot candid films and street-corner interview tapes ran through the projectors stomach pains. "Why don't people respond us how long we can expect this program to quiet things down, we can give Charlie a deadline to crack his differential factor, people begin seeing what the Grdznth are giving us, they'll welcome them with open arms." "Hmmm," said Pete. "Well, why won't they? The people just didn't trust us, that was all. What does the man in the street know about transmatters? Nothing. But give him one, and then try to take it into his pockets. "Do you realize where we're thing? We're out on a limb—way out. We're fighting for time—time for Charlie and his gang to crack the puzzle, time for the Grdznth girls to gestate. But what are we hearing from Charlie?" Nothing is what we're hearing through just as fast as they can. I'm beginning to wonder what the Grdznth are giving us." "Well, they can't gestate forever." "Maybe not, but I still have a burning desire to talk to "Sorry," the operator said. "Nobody's gotten through there for three days." "Yes, sir. But first they want you in Analysis."

<question>:
What does the Public Relations Bureau do?

<options>:
A Sell movies to people who don't want to buy them
B Manage the campaign for Senator Stokes
C Manage the media relating to Grdznth
D Keep the public from finding out about time travel

<answer>:

C