Question

finding bombs in germany
during world war ii, american and british forces dropped millions of tons of bombs on german cities. nearly ten percent of the bombs never exploded. the war ended in 1945, but more than two thousand tons of unexploded bombs are still found in germany each year. before any construction project is undertaken, the site must be checked for unexploded bombs. buried bombs are often discovered. for this reason, germany has a special force of firefighters and police officers, called the kmbd, to defuse and remove these bombs. even though the war has been over for seven decades, the kmbd is one of the busiest bomb squads on the planet.
what is the main, or central, idea of the passage?
almost ten percent of the bombs dropped on germany during world war ii never exploded.
because there is so much construction in germany, the country has a special force trained to defuse bombs.
because there are so many unexploded bombs in germany, the country has a special force trained to defuse them.

Explanation:

The passage first mentions the large - number of unexploded bombs from World War II in Germany. Then it states that due to these unexploded bombs, Germany has a special force (KMBD) to defuse and remove them. The first option only focuses on the percentage of unexploded bombs, and the second option attributes the special force to construction rather than the presence of unexploded bombs. The third option correctly summarizes that the existence of many unexploded bombs leads to the special - force for defusing them.

Answer:

Because there are so many unexploded bombs in Germany, the country has a special force trained to defuse them.