question:  Which of the following isn't a reason that Svan's plan failed?
context: DOUBLECROSS by JAMES Mac CREIGH Revolt was brewing on Venus, led by the descendant of the first Earthmen to land. Svan was the leader making the final plans—plotting them a bit too well. [Transcriber's Note: This etext was produced from Planet Stories Winter 1944. There was no reason why everything shouldn't have been functioning perfectly, of course, but he was pleased to have it confirmed, all the same. "Everything shipshape, I take it!" But after all, they're human beings, just like us—" "Not any more. Four or five generations ago they were. "They had to acclimate themselves to Venus's climate. The native guard of honor, posted a hundred yards from the Earth-ship, stood stolidly at attention with their old-fashioned proton-rifles slung over their backs. A few natives were gazing wonderingly at the great ship, but made no move to pass the line of guards. They think there will be hordes of immigrants from Earth, now that we know Venus is habitable. And there's some sort of a paltry underground group that is spreading the word that the immigrants will drive the native Venusians—the descendants of the first expedition, that is—right down into the mud. "From their own mouths you have heard it. "Then we must act. The Council has told us that we alone will decide our course of action. We have agreed that, if the Earth-ship returns, it means disaster for Venus. Therefore, it must not return." "The Council did not know what we would face. The Councilmen could not come to the city and see what strength the Earth-ship has." It will be set by means of this dial—" he touched a spot on the surface of the globe with a pallid finger—"to do nothing for forty hours. Atomite." There will be danger, I think...."
output:  A guard knocked him unconscious and brought him to the Earth ship
options:  Ingra came back for Svan because guards were after them  A guard stopped them and wouldn't let them get through  There were more people guarding the ship because of the spy-ray  A guard knocked him unconscious and brought him to the Earth ship