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 love. Since this place had been designed to excite the senses of both humans and Venusians, the love feelings were heavily tinged with straight sex. He sniffed at them, feeling them somewhere inside of him, aware of them but aware also that here was apprehension, and plain fear. Caldwell, sitting in a booth next to the door, glanced up as Johnson entered but neither Caldwell's facial expression or his eyes revealed that he had ever seen this human before. Nor did Johnson seem to 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 headwaiter was bowing to him. "I'll have a tarmur to start," Johnson said. "How are the dreams tonight?" 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 at the bar. Behind it, a Venusian was bowing to him. "Tarmur," Johnson below the necklace ... Johnson felt his pulse quicken, for two reasons. "They are beautiful," he said, smiling. Sombrely, Johnson regarded her. What was she doing here? Was she in the employ of the Venusians? If she was being planted on him, then his purpose here was suspected. He shrugged the thought aside. If his purpose here was suspected, there would be no point in planting a woman "You have decided them?" "Yes." "Every last one of them?" "Oh, there might be one or two matters undecided somewhere, say out on the periphery of the galaxy. But we will solve them when we get to himself into an empty stool on his left. The man was Caldwell. "Zlock!" Caldwell said, to the bartender. "Make it snappy. Gotta have zlock. Finest damn drink in the solar system." Caldwell's voice was thick, his tongue heavy. Johnson's eyes went back to the girl but out of the corner of them he watched Caldwell's hand lying on the bar. The "I haven't seen him," Caldwell's fingers beat out their tattoo. "But I "Um," Johnson said, his eyes on Vee Vee. "How—" "Because that girl was asking for him," Caldwell's fingers answered. Caldwell. merriment that danced in them there was ice. Johnson felt cold. bowing and scraping in front of him. "The great one has decided, yes?" darling?" She hooked her hand into Johnson's elbow. "Certainly," Johnson said. The decision was made on the spur of the he might be there. Vee Vee, her hand on Johnson's elbow, rose. Johnson stood up with "Good," Johnson said. say she held no malice. Her fingers tightened on Johnson's arm. He 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?" "Please!" Her voice grew sharp. "I think Johnny Johnson ought to know." "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 "And how would I make certain you were Johnny Johnson, except by seeing "Please, darling, you are making a scene. I am sure this is the last thing you really want to do." He looked quickly around them. The Venusians and humans moving into to her. Again she patted his arm. "Relax, darling. Your secrets are safe with The fingers on his arm were very gentle. "No harm will come to you. Am I not with you?" were—his life, Caldwell's life, possibly Vee Vee's life hung in the balance. Didn't she know that this was true? And as for Martin—But Caldwell had said that she had been asking about Martin. What connection did she have with that frantic human genius he sought here? 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 thick and heavy. He sprawled to the floor on Johnson's left. Under the man's coat, Johnson caught a glimpse of a slight bulge, the zit operation but they knocked out a human or a Venusian in a matter of seconds. True, the person they knocked unconscious would be all right the next effective weapons, but Johnson had a fondness for them. The feel of the Unger stood in the middle of the spot of light. Johnson felt his chest muscles contract, then relax. Vee Vee's fingers sought his arm, not to harm him but running to him for protection. He caught the flutter of her breathing. On his left, Caldwell stiffened Johnson had not seen Unger appear. One second the circle of light Vee Vee's fingers dug deeper into Johnson's arm. "How—" "Shhh. Nobody knows." 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 Caldwell were gone. They were no longer in his reality. They were not the 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 Beside him, Vee Vee was silent, her face ecstatic, like the face of a woman in love. He tried again for the space ship. It would not come. We are seeing it. We are reporting accurately to you. That Venusian Buddha is levitating. We, your eyes, do not lie to you!" "I—" Johnson whispered. "We are your adrenals. We are pouring forth adrenalin." "I am your pancreas. I am gearing you for action." "I am your thyroid. I...." 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. "But hurry. We are excited." "There is a time to be excited and a time to hurry. In this situation, if action is taken before the time for it—if that time ever comes—we can all die." "Die?" the chorus quavered. "Yes," Johnson said. "Now be quiet. When the time goes we will all go together." The chorus went into muted silence. But just under the threshold the little voices were a multitude of tiny fretful pressures. "Please!" Johnson said. "What happened?" meaning. His hand dived under his coat for the gun holstered there. At 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 if some pleasant dream had been interrupted. On Johnson's right, Vee Vee seemed to flow to life. Her arms came up Johnson had no time to ask her what she meant. Somewhere in the back Venusians were attacking a man. "It's Martin!" Caldwell shouted. "He is here!" In Johnson's hand as he came to his feet the zit gun throbbed. He fired blindly at the mass of Venusians. Caldwell was firing too. The soft "To hell with the woman!" Caldwell grunted. "Martin's the important one." Zit, zit, zit, Caldwell moved toward the rear, shooting as he went. Johnson followed.

<question>:
What is the relationship like between Caldwell and Johnson?

<options>:
A Adversarial colleagues
B Secret lovers
C Suspicious and guarded
D Partners on a mission

<answer>:

D