input: Text: (A) He is holding the ship ransom as revenge for what American has done to Germany. (B) He is holding the ship ransom for Boarts—black diamonds. (C) He wants to use its zone of silence to apprehend the Carthusia. (D) He wants to use its zone of silence to trick other ships into crashing on the islet. SILENCE IS—DEADLY By Bertrand L. Shurtleff Radio is an absolute necessity in modern organization—and particularly in modern naval organization. If you could silence all radio—silence of that sort would be deadly! The hurried rat-a-tat of knuckles hammered on the cabin door. Commander Bob Curtis roused himself from his doze, got up from his chair, stretched himself to his full, lanky height and yawned. That would be Nelson, his navigating officer. Nelson always knocked that way—like a man in an external state of jitters over nothing at all. Curtis didn't hurry. It pleased him to let Nelson wait. He moved slowly to the door, paused there, and flung a backward glance at the man in the cabin with him—Zukor Androka, the elderly Czech scientist, a guest of the United States navy, here aboard the cruiser Comerford. The wizened face of the older man was molded in intent lines of concentration, as his bushy gray head bent over his drawing board. Curtis got a glimpse of the design on which he was working, and his lips relaxed in a faint smile. Androka had arrived on board the Comerford the day before she sailed from Norfolk. With him came a boatload of scientific apparatus and equipment, including a number of things that looked like oxygen tanks, which were now stored in the forward hold. Androka had watched over his treasures with the jealous care of a mother hen, and spent hours daily in the room in the superstructure that had been assigned as his laboratory. Sometimes, Curtis thought old Androka was a bit wacky—a scientist whose mind had
  Question: Why is Brandt interested in The Comerford? 
  Answer:
output: He wants to use its zone of silence to apprehend the Carthusia.