 Which is the best deccription of why the humans are feared by other alien races?
The sight of an Earthman on Vega III, where it was impossible for an outlander to be, brought angry crowds to surround John Crownwall as he strode toward the palace of Viceroy Tronn Ffallk, ruler of Sector XII of the Universal Holy Empire of Sunda. He ignored the snarling, the spitting, the waving of boneless prehensile fingers, as he ignored the heavy gravity and heavier air of the unfamiliar planet. But here, surrounded by this writhing, slithering mass of eight-foot creatures, he felt distinctly unhappy. These humanoids had large mouths and sharp teeth, and they unquestionably slavered. If they carried out the threats of their present attitude, Earth would have to send Marshall to replace him. The clashing teeth of the noisiest of them were only inches from the quivering flesh of his back as he reached the upper level. A pair of guards, their purple hides smoothly polished and gleaming with oil, crossed their ceremonial pikes in front of him as he approached the entrance. "And just what business do you have here, stranger?" asked the senior of the guards, his speaking orifice framing with difficulty the sibilances of Universal Galactic. If you know what's good for you, you'll get out of here while you can still walk. "Just tell him that a man has arrived from Earth to talk to him. Behind him stood a heavy and pompous appearing Vegan in lordly trappings. "But then I'm told you're an Earthling. "It was only decided yesterday, back on Earth, that I would be the one to make the trip here. Even if you could spy through buildings on Earth from space, which I doubt, your communications system can't get the word through that fast." What I meant was that I expected someone from Earth to break through our blockade and come here. Still, if you were on your home planet only yesterday, that's astonishing even to me. "If you wanted someone from Earth to come here to see you, why did you put the cordon around Earth? And why did you drop a planet-buster in the Pacific Ocean, and tell us that it was triggered to go off if we tried to use the distorter drive? But you did come, so I can tell you that although I am the leader of one of the mightiest peoples in the Galaxy, whereas there are scarcely six billions of you squatting on one minor planet, we still need each other. "We offer you partnership with us to take over the rule of the Galaxy from the Sunda—the so-called Master Race."
 Their technology and ideas develop at a rapid pace
 Their technology and ideas develop at a rapid pace  They are known to wipe out alien races with their time travel technology  They have superior strategies to get past any race's defense system  They have control of large amounts of bombs that can be used to destroy planets