Read the excerpt from The Dark Game.As a result of the cut cables, Germany lost its most secure long-distance communications system. The Germans now had to rely on radio transmissions from their powerful wireless station at Nauen, a few miles from Berlin. Which was exactly what the British military knew they would have to do. And once the Germans began sending wireless messages, MI8, the British code breakers, began plucking them from the air. Of course, all German correspondence was sent in a complicated cipher system, so that was when the hard work began for the code breakers of MI8.
The excerpt explains how one event led to another: when Germany’s cables were cut, the Germans had to rely on radio transmissions. That change allowed MI8 to intercept their messages, so the passage is organized by cause and effect. “Cause and effect” is the correct choice.
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