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

<passage>:
When Johnson found him, he found too the secret to that Johnson got rain in his eyes, his nose, and his ears. That was the way Johnson. Opening the door of the joint, it was noise instead of rain Feeling states came at him, intangible, but to his trained senses, perceptible emotional nuances of hate, love, fear, and rage. But mostly love. Since this place had been designed to excite the senses of both humans and Venusians, the love feelings were heavily tinged with Caldwell, sitting in a booth next to the door, glanced up as Johnson entered but neither Caldwell's facial expression or his eyes revealed recognize Caldwell. "Is the mighty human wanting liquor, a woman or dreams?" His voice was all soft syllables of liquid sound. The Venusian equivalent of a one?" As he was speaking, the headwaiter was deftly conducting Johnson "Not just yet," Johnson said. "See me a little later." "But certainly." The headwaiter was gone into the throng. Johnson was below the necklace ... Johnson felt his pulse quicken, for two reasons. "They are "You were talking about my eyes," she answered, unperturbed. "How did you know? I mean...." Vee Vee." "Vee Vee? Um. That is...." Sombrely, Johnson regarded her. What was she doing here? Was she in them." He waved vaguely toward the roof and the sky of space hidden himself into an empty stool on his left. The man was Caldwell. of the corner of them he watched Caldwell's hand lying on the bar. The think he is, or was, here." "Um," Johnson said, his eyes on Vee Vee. "How—" "Because that girl was asking for him," Caldwell's fingers answered. Caldwell. bowing and scraping in front of him. "The great one has decided, yes?" "The dreaming!" Vee Vee looked suddenly alert. "Of course. We must see into his muscles. Pain shot through his arm, paralyzing it and almost paralyzing him. He knew instantly that she was using the Karmer nerve block paralysis on him. His left hand moved with lightning speed, the Johnson saw that Caldwell had risen and was following them. Caldwell's signs. Johnson ignored them. With Vee Vee's fingers lightly patting his "Yes." "What is it?" "How would I know?" "Please!" Her voice grew sharp. "I think Johnny Johnson ought to know." is incognito on Venus?" Her voice had a teasing quality in it. "But—" "And who besides Johnny Johnson would recognize the Karmer nerve grip and be able to break it instantly?" "Hell—" "John Michael Johnson, known as Johnny to his friends, Earth's foremost expert in the field of electro-magnetic radiations within the human body!" Her words were needles of icy fact, each one jabbing deeper and if you could break the Karmer nerve grip? If you could break it, then there was no doubt who you were!" Her words went on and on. "Who are you?" His words were blasts of sound. me." A gray color came up inside his soul. "But—but—" His voice was suddenly weak. Caldwell had said that she had been asking about Martin. What Johnson felt his skin crawl. He moved toward a nest of cushions on "Sorry, bud. Didn't mean to bump into you." Caldwell's voice was still operation but they knocked out a human or a Venusian in a matter of seconds. illumination on the mat and the headrest at the bottom of the room. The Johnson felt his chest muscles contract, then relax. Vee Vee's fingers caught the flutter of her breathing. On his left, Caldwell stiffened Johnson had not seen Unger appear. One second the circle of light that would impede movement. He had appeared in the bright beam of the spotlight as if by magic. Vee Vee's fingers dug deeper into Johnson's arm. "How—" "Shhh. Nobody knows." No human knew the answer to that trick. Unless perhaps Martin— Unger bowed. A little ripple of something that was not quite sound went to sleep. Johnson saw the Dreamer's eyes close, watched the chest dug at Johnson's arm as if they were trying to dig under his hide for lay motionless. Johnson found himself with the tendency to hold his The Venusian watchers had relaxed. They looked as if they were asleep, Caldwell were gone. They were no longer in his reality. They were not that here and now he was making contact with a vision that belonged to time. He started to his feet. Fingers gripped his arm. "Please, darling. You startled me. Don't move." Vee Vee's voice. Who was Vee Vee? "I ... I was watching something else. When you moved I broke contact with my dream." "Your dream?" sound in the darkened room. Johnson settled down. A glance to his left told him that Caldwell was still sitting like a chunk of stone.... The Somehow he had the impression that the whirring sound which kept intruding into his consciousness was stopping the vision. So far as he could tell, he was the only one present who was not him. "This is it!" a voice whispered in his mind. "This is what you came to Venus to see. This ... this...." The first voice went into silence. Another voice took its place. "This is another damned vision!" the second voice said. "This ... this is something that is not real, that is not possible! No Venusian Dreamer, and no one else, can levitate, can defy the laws of gravity, can float upward toward the ceiling. Your damned eyes are tricking you!" "We are not tricking you!" the eyes hotly insisted. "It is happening. We are seeing it. We are reporting accurately to you. That Venusian Buddha is levitating. We, your eyes, do not lie to you!" "You lied about the space ship!" the second voice said. "I—" Johnson whispered. "I am your skin," another voice whispered. "I am covered with sweat." "We are your adrenals. We are pouring forth adrenalin." "I am your pancreas. I am gearing you for action." "I am your thyroid. I...." A multitude of tiny voices seemed to whisper through him. It was as if the parts of his body had suddenly found voices and were reporting to him what they were doing. These were voices out of his training days when he had learned the names of these functions and how to use them. "Be quiet!" he said roughly. The little voices seemed to blend into a single chorus. "Action, Master! Do something." "Quiet!" Johnson ordered. "Yes," Johnson said. "Now be quiet. When the time goes we will all go together." "I hear a whirring sound," his ears reported. "Please!" Johnson said. "Master, we are not lying!" his eyes repeated. "Watch Unger!" Johnson said. The Dreamer floated. If wires suspended him, Johnson could not see them. If any known force lifted him, Johnson could not detect that "Yaaah!" The silence of a room was broken by the enraged scream of a Venusian being jarred out of his dream. "Damn it!" A human voice said. A wave as sharp as the tip of a sword swept through the room. There was a split second of startled silence in the Dreaming Room. The silence went. Voices came. "What happened?" "That human hidden there did it! He broke the Dreaming!" Anger marked the voices. Although the language was Venusian, Johnson got most of the his left, Caldwell was muttering thickly. "What—what happened? I was back in the lab on Earth—" Caldwell's voice held a plaintive note, as Johnson had no time to ask her what she meant. Somewhere in the back "It's Martin!" Caldwell shouted. "He is here!" slid out of his sight. "Vee Vee!" Johnson's voice became a shout. Zit, zit, zit, Caldwell moved toward the rear, shooting as he went. Johnson followed.

<question>:
How do Caldwell and Johnson keep in communication when they are out of sight of each other?

<options>:
A Wrist phones
B Sending notes with the waiter
C They don't
D Telepathy

<answer>:

C