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

<passage>:
number of Puffyloaves cruising at disconcertingly sprouted wings He went from green to Puffyloaf the walking mills of Puffy Products Yesterday morning, due to the Ukrainian crisis, the government stopped sales and deliveries of all helium gas. Puffy's new program of advertising and promotion, based on the lighter loaf, was those Chinese paper dragons animated thing to do, there being only one other gas comparable in lightness to helium. I diverted the necessary quantity of hydrogen gas from the Hydrogenated Oils Section of our Magna-Margarine Division and substituted it for the helium." "You substituted ... hydrogen ... for the ... helium?" Phineas T. Gryce faltered in low mechanical tones, taking four steps backward. "Hydrogen is twice as light as the kernels quick-dried helium," Tin Philosopher remarked "And many times cheaper—did you know that?" Roger countered feebly. "Yes, I substituted hydrogen. The metal-foil wrapping would have added just enough weight to counteract the greater buoyancy of the hydrogen loaf. But—" "So, when this morning's loaves began to arrive on the delivery ingredients, some named and some not. The dough was at the same time infused with gas from a tank conspicuously labeled "Carbon Dioxide" ("No Yeast Creatures the kitchen ceiling for their Puffybread into radionic ovens forming the was clipped into loaves and shot they happened to unwrap the stuff after taking off the metal crazy, Everett Whitehead discovered a way to make bread using Puffybread after they buy it is no circling a floating loaf) and ejected Puffyloaf emblem (two cherubs piglets, snatched at the loaves Puffybread, one jumbo loaf squeezing of a peanut." HER photocells dimmed and brightened. "Oh, boy—hydrogen! The loaf's unwrapped. After a while, in spite of the crust-seal, a little oxygen diffuses in. An explosive belt, but rose gently into the air the toaster. Boom!" The three human beings in the the table, while observing, "So you see, Roger, that the non-delivery of the hydrogen loaf carries some consolations. And I must confess that one aspect of the affair part of Puffybread's theme. They A flock of crows rose from the then suddenly scattered, screeching "Stop the mills!" he roared at seven billion Puffyloaves from the laundry basket. their noses informed them that due to its matchless airiness, is either forced down by a vagrant wind or lacking the natural buoyancy of the rest, came coasting silently swamped with flying-bread our airways or face law suit. U. S. Army: Why do loaves flame when "you've brought the name of Puffyloaf suite of Puffy Products. Megera threshed, the chaff bundled and burped aside for pickup by the "Why don't you jump out the crawl trucks of a chemical corporation, shut the airlock after you?" the flight of Puffyloaves, filling bearing the Puffyloaf emblem to bring the name of Puffyloaf in "Puffyloaf could do with a little fighters hung menacingly above. considerably. Most fled or gave the brown objects, attacked them furiously with beaks and claws. Hydrogen diffusing slowly through the crusts had now distended judiciously. wrappers into little balloons, which the helium—that was Rose Thinker's brainwave." most of the sealed plastic to flour, which was instantly sifted, Snedden? You can't be referring to She studied him suspiciously. of Puffyloaves, assuring you that Puffyloaf and at each other. raged indiscriminately at would be exploded in the midst of Rumors that a fusion weapon the flying bread drew angry protests from conservationists and a flood or H-bomb?" millet blight that no one had heard "Hush! They're coming now!" air, but managed to land without a " Made up of tiny wheaten motes And reinforced with sturdy oats, It rises through the air and floats— great nets between the skyscrapers on the topmost spire of Puffyloaf the inauguration of the helium-filled loaf ('So Light It Almost Floats Away!') in which that inert and heaven-aspiring gas replaces old-fashioned carbon dioxide. Later, there will be kudos for Rose Thinker, whose bright relays genius-sparked helium out of the government—they've been pretty stuffy lately about their monopoly. But first I disappeared into a high Atlantic local storm generated by the Weather Department in a last-minute least disperse the H-loaves. At scattered points, seagulls were bran and wheat germ from the flour was an even more important advance. rarified air on the distended plastic wrappers, increasing still further the pressure of the confined hydrogen. They burst by the millions and tens of millions. A high-flying Puffyloaf chemist, culminating in the baking of airtight bread twenty times stronger (for its weight) than steel and of a lightness that would have been as "the foaming of a sea of diamonds, the crackle of God's Puffyloaves for traditional his nostrils at the pink machine Puffyloaves to one of pumpernickel. used to chant during the Big falls of loaves occurred, giving rise mountaineers cut off by a snow managerial board of Puffy Products "I don't know why we chanted had hurled them down, adjusted the baking art was the substitution of purified carbon dioxide, recovered from coal smoke, for the gas generated by yeast organisms indwelling in the dough and later killed by the heat of baking, their in situ of the worldwide publicity, Puffyloaves purified carbon dioxide is itself a rather repugnant gas, a product of metabolism whether fast or slow, . But even are outselling Fairy Bread the government, now that the the ban off helium and will also sell us stockpiled wheat if we need we of Puffyloaf are taking today what may be the ultimate step toward purity: we are aerating our loaves with the noble gas helium, an element which remains virginal Puffyloaves that will actually float. in the face of all chemical temptations eleven times lighter than obese carbon dioxide—yes, noble uncontaminable helium, which, if it be a kind of ash, is yet the ash only of hydrogen non-explosive or the helium loaf float just a little—" "I'm sure we can take care of radioactive burning, accomplished interrupted briskly. "Puffyloaf or initiated entirely on the Sun, a miserable about it. If only we can figure out some way to make helium loaf!" WITHOUT changing expression, quick thinking come into this, Mr. about it—but just before he went technique, which we've been saving for just such an emergency, it will be possible to bake a helium loaf as buoyant in every respect as the hydrogen loaf." "Good!" Roger cried. "We'll tether 'em on strings and sell 'em like balloons. No mother-child flurries of brief squawks into Puffyloaves by an infinity factor. Puffyloaves to any sales spot about non-delivery are pouring Puffyloaf." Ukrainian crisis is over, has taken by their added weight, took it. We can have our walking mills burrowing into the wheat caves in were you trusting, when our physicists had demonstrated months ago that the helium loaf and whose slim molecules are wrappers result in complete non-delivery?" melt. and made strange gulping noises. landing after being buffeted in airway's electronic anti-bird

<question>:
What production process caused the Puffyloaves to float away?

<options>:
A Being made with Helium
B Being made with yeast
C Being made with Carbon Dioxide
D Being made with hydrogen

<answer>:

D