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

<passage>:
JAMES BARON was not pleased to hear that he had had pardons, Mr. Baron. The gentleman—he would leave no Too smoothly, it seemed to me, and the others seemed to think so, too. McIvers’ restlessness was beginning to grate on our nerves. He talked too much, while we were resting or while we were driving Now Baron drummed his fingers on the table top, staring number. Across to the right was a group that Baron knew wisecracks, witticisms, unfunny jokes that wore thin I figured that it would pass off after a while. I was apprehensive down at Baron’s table. He was short and wiry. His face held constantly and the skin on our faces itched and tingled at the end of an eight-hour trek. But it took one of those side trips of McIvers’ to deliver the penultimate blow to our already fraying nerves. He had driven The grizzled man searched Baron’s face for a moment “Say, who are you, if you don’t mind?” Baron demanded. “The name is Claney,” said the stranger. There was a silence. Then: “Claney? of a Bug Claney?” Baron’s eyes were wide with excitement, all trace of anger “Quit looking!” Baron bent forward over the table. “My miscalculate? What were the trouble spots?” Baron jabbed a finger at Claney’s face. “That, for instance—epithelioma? “You want to know why we failed?” asked Claney. McIvers’ scheme for an advanced scout more dangerous for I caught myself wishing that the Major had okayed “It’s simple. We failed because it can’t be done. We couldn’t One error in judgment could sink us all, but I wasn’t thinking the individual, maybe, but I was driving blind now and I didn’t me , plenty worried. I kept thinking, better McIvers should go than me. It wasn’t healthy thinking and I knew it, but I couldn’t get the thought out of my mind. “Nonsense,” Baron declared. “We will.” can blame the equipment or the men—there were flaws in that whipped us, that and the Claney shrugged. “I was there. I know what I’m saying. You It was the “Never,” said Baron. “Let me tell you,” Peter Claney said. then I edged my Bug I know now that they were a pair of idiots, starting off without place. Too many men in this game are all nerve and luck, He threw his head back. “Why try a Crossing at aphelion? It would be a hellish trek. Only a few men had ever learned he’d been with the Major at Vulcan and had begged to join this trek. I had a funny feeling that Jack really didn’t care for liable to get awfully uneasy and none of them can ever give you an answer that makes sense. Anyway, Stone had borrowed three men from the Lab, and had the supplies and equipment all lined up when we got there, ready to check and test. with special lead-cooled cut-in engines when the heat set in, and one heavy-duty tractor model for pulling the sledges. The Major went over them like a kid at the circus. Then he said, “Have you heard anything from McIvers?” “Who’s he?” Stone wanted to know. “He’ll be joining us. He’s a good man—got quite a name for climbing, back home.” The Major turned to me. “You’ve probably heard of him.” I’d heard plenty of stories about Ted McIvers and I wasn’t too happy to hear that he was joining us. “Kind of a daredevil, isn’t he?” The Major laughed. “I don’t think we need to worry about McIvers. We understood each other when I talked up the trip to him and we’re going to need each other too much to do any fooling around.” He turned back to the supply list. to cut weight sharply and our time is short. Sanderson says we should leave in three days.” Two days later, McIvers hadn’t arrived. The Major didn’t say much about it. Stone was getting edgy and so was I. We It seemed that the more we considered the problem, the that avoided those upheavals as far as possible. But in the final analysis, we were barely scraping the surface. The only way we would find out what was happening where was to be there. Finally, on the third day, McIvers blew in on a freight Stone and McIvers were thick as thieves, and everything was set for an early departure after we got some rest. “And that,” said Baron, finishing his drink and signaling the waiter for another pair, “was your first big mistake.” Peter Claney raised his eyebrows. “McIvers?” “Of course.” Claney shrugged, glanced at the small quiet tables around reliable at first glance. Anyway, personality problems weren’t worried us first and Baron nodded in agreement. “What kind of suits did you “The best insulating suits ever made,” said Claney. “Each one had an inner lining of a fiberglass modification, to avoid if the suits failed somewhere.” “How about the Bugs?” “You weren’t!” Baron exclaimed. “Why not?” forward work on foot.” Claney smiled bitterly. “Which meant Baron licked his lips. His fingers stroked the cool, wet glass “Oh, yes,” said Claney, “we started on schedule, all right. time-consuming. Delays could cost us our lives. We all knew “Peter, you’ll take the lead Bug, the small one we stripped down for you. Stone and I will flank you on either side, giving you a hundred-yard lead. McIvers, you’ll have the job of dragging the sledges, so we’ll have to direct your course pretty closely. Peter’s job is to pick the passage at any given point. If there’s any doubt of safe passage, we’ll all explore ahead on foot before we risk the Bugs. Got that?” McIvers and Stone exchanged glances. McIvers said: “Jack and I were planning to change around. We figured he could take the sledges. That would give me a little more mobility.” The Major looked up sharply at Stone. “Do you buy that, Jack?” Stone shrugged. “I don’t mind. Mac wanted—” McIvers made an impatient gesture with his hands. “It doesn’t matter. I just feel better when I’m on the move. Does it make any difference?” “I guess it doesn’t,” said the Major. “Then you’ll flank Peter along with me. Right?” “Sure, sure.” McIvers pulled at his lower lip. “Who’s going to do the advance scouting?” “It sounds like I am,” I cut in. “We want to keep the lead McIvers shook his head. “No, I mean the advance work. “But why not? We could save ourselves days!” climber knows that everybody is safer in a party than one man alone—any time, any place.” McIvers stared at him, his cheeks an angry red. Finally he gave a sullen nod. “Okay. If you say so.” “Well, I say so and I mean it. I don’t want any fancy stuff. We’re going to hit Center together, and finish the Crossing together. Got that?” McIvers nodded. Mikuta then looked at Stone and me and we nodded, too. “All right,” he said slowly. “Now that we’ve got it straight, back over my shoulder, I could see the Major and McIvers crawling out behind me, their pillow tires taking the rugged floor of the gorge smoothly. Behind them, Stone dragged the sledges. came due, we pulled the Bugs together into a square, threw up we’d have drunk ourselves into nephritis in a week otherwise. We didn’t sleep the first few stops, as a consequence. Our but we couldn’t sleep them off. We sat around looking at each other. Then McIvers would say how good a beer would Yet we knew that even the land might have been conquered

<question>:
What does Baron think was one of the mistakes Claney's team made?

<options>:
A Trying to cross on foot
B Using suits with fiberglass lining
C Not counting on the Bugs for protection
D Asking McIvers to be on the team

<answer>:

D