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

<passage>:
with soft white-and-brown material. Emblems on plastic wrappers embedded in material identify it incontrovertibly as an undetermined disconcertingly sprouted wings He went from green to Puffyloaf stopped sales and deliveries of all strategic stockpiled materials, including Operation!") began to tread delicately The walking mills resembled fat metal serpents, rather larger than those Chinese paper dragons animated on their centipede legs As they advanced, their heads swung lazily from side to side, very much like snakes, gobbling the yellow grain. In their throats, it was threshed, the chaff bundled and 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 kitchen ceiling for their Puffybread after taking off the metal wrapper, or reach for the sky if they happened to unwrap the stuff matter of seconds, a fierce heat-front browning the crusts, and the piping-hot loaves sealed in transparent outdoors?" Puffybread after they buy it is no plastic bearing the proud Puffyloaf emblem (two cherubs circling a floating loaf) and ejected of pickup machines, like hungry piglets, snatched at the loaves with hygienic claws. A few loaves would be hurried a while, in spite of the crust-seal, a little oxygen diffuses in. An explosive the toaster. Boom!" The three human beings in the room winced. part of Puffybread's theme. They crows swooped to investigate and then suddenly scattered, screeching in panic. "Stop the mills!" he roared at brown fliers and did not return for a second look. the old flying-saucer scares, stated due to its matchless airiness, is eight and one-half loaves per person per day." swamped with flying-bread inquiries. Aero-expresslines: Clear our airways or face law suit. U. S. Army: Why do loaves flame when hit by incendiary bullets? U. S. Customs: If bread intended for export, get export license or face is accusing us of a hoax inciting to of stratosphere-tickling towers cried with a hysteria that would "you've brought the name of Puffyloaf suite of Puffy Products. Megera unkind. "When are your high-strung, flight of Puffyloaves, filling Private fliers approached the brown and glistening bread-front in curiosity and dipped back in awe. bearing the Puffyloaf emblem to bring the name of Puffyloaf in fighters hung menacingly above. "Puffyloaf could do with a little nutritive nature of the translucent brown objects, attacked them furiously with beaks and claws. Hydrogen diffusing slowly through the crusts had now distended most of the sealed plastic wrappers into little balloons, which ruptured, when pierced, with disconcerting pops . bumble, Roger. I can see it in your eyes. I only hope it's not cranks and cultists had a field day, crowded streets and back yards, of Puffyloaves, assuring you that Puffyloaf and at each other. raged indiscriminately at would be exploded in the midst of the flying bread drew angry protests the Board eating out of my hand." "Hah! I guarantee you won't or H-bomb?" of telefax pamphlets titled "H-Loaf from conservationists and a flood today!—you're going to see have any fingers left. You're bold millet blight that no one had heard "Hush! They're coming now!" Stockholm sent a mystifying Made up of tiny wheaten motes And reinforced with sturdy oats, on the topmost spire of Puffyloaf was clipped into loaves and shot to shoot down the loaves as they Recaptured by Tin Philosopher, into radionic ovens forming the who suffered only minor bullet holes, he was given a series of mild "Listen to me, Meg. Today—yes, midsections of the metal serpents. overcast, also thereby evading a local storm generated by the There the bread was baked in a Warnings and counterwarnings At scattered points, seagulls were observed fighting over individual bran and wheat germ from the flour was an even more important advance. Early bleaching and preserving chemicals played their humble parts. "For a while, barbarous faddists—blind was enough to evoke guffaws. Atlantic storm widely reported to have destroyed it, passed unobserved across a foggy England and rose out of the overcast only over last reached their maximum altitude. The Sun's rays beat through the rarified air on the distended plastic wrappers, increasing still further the pressure of the confined hydrogen. They burst by the millions Puffyloaf chemist, culminating in flier and who was the sole witness of the event, afterward described it as "the foaming of a sea of diamonds, the crackle of God's knuckles." Puffyloaves for traditional his nostrils at the pink machine Puffyloaves to one of pumpernickel. smoldering. He said mildly, "A being blown to bits by booby-trapped bread, was quietly destroyed. Congratulatory notes were exchanged by various national governments When you die— It's a lie! "I don't know why we chanted managerial board of Puffy Products slumped in utter collapse around the conference table, the Empty coffee cartons were scattered around the chairs of the three humans, dead batteries around had hurled them down, adjusted in the dough and later killed by the heat of baking, their corpses remaining in situ of the worldwide publicity, Puffyloaves we of Puffyloaf are taking today Puffyloaves that will actually float. in the face of all chemical temptations and whose slim molecules are eleven times lighter than obese miserable about it. If only we can figure out some way to make hydrogen non-explosive or the radioactive burning, accomplished carbon dioxide—yes, noble uncontaminable helium loaf float just a little—" interrupted briskly. "Puffyloaf flurries of brief squawks into tether 'em on strings and sell 'em like balloons. No mother-child shopping team will leave the store Puffyloaves by an infinity factor. Puffyloaves to any sales spot Puffyloaf." been some unforeseeable difficulty involving the new metal-foil wrappers." "Metal-foil wrappers? Were you responsible for those?" unless—just possibly—there's around him. "My sweet little ever-victorious, enough to cause drift during stackage. Drafts in stores might topple sales pyramids. Metal-foil wrappers, by their added weight, took care of the difficulty." "And you ordered them without consulting the Board?" self-propelled monkey wrench!" she and—" "Why, you fool! I noticed that order for metal-foil wrappers, assumed it was some sub-secretary's mistake, and canceled it last night!" gave us away at the start with that "You canceled it?" he quavered. "And told them to go back to the lighter plastic wrappers?" "Of course! Just what is behind all this, Mr. Snedden? 'bread overhead' jingle. We've struck another blow against the was safely stackable in light airs and gentle breezes—winds up to wrappers result in complete non-delivery?" ROGER Snedden's paleness became tinged with an interesting squawks in her earphones. in airway's electronic anti-bird fences. After grounding safely near Emporia—no fatalities—pilot's windshield found thinly plastered

<question>:
Why were the Puffyloaves flaming when hit with incendiary rounds?

<options>:
A There was too much bran and germ left in the wheat used to make the loaves
B The helium in the loaves was catching on fire
C Oxygen mixing into the hydrogen and creating a flammable substance
D The clear plastic wrappers were extremely flammable

<answer>:

C