Why won't Nemo let Aronnax and his friends leave the submarine? A. Nemo thinks Aronnax and his friends cannot be trusted and must be watched at all times. B. Nemo needs the help of Aronnax and his friends to operate the submarine. C. Nemo wants to show off the wonders of his submarine to Aronnax and his friends. D. Nemo fears Aronnax and his friends will tell the world about his submarine.