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 knbd, to defuse and remove these bombs. even though the war has been over for seven decades, the knbd is one of the busiest bomb squads on the planet.
what is the main, or central, idea of the passage?
because there is so much construction in germany, the country has a special force trained to defuse bombs.
almost ten percent of the bombs dropped on germany during world war ii never exploded.
because there are so many unexploded bombs in germany, the country has a special force trained to defuse them.

Explanation:

The passage discusses the large number of unexploded bombs from World War II in Germany and the existence of the KNBD, a special force to defuse them due to the ongoing discovery of these bombs.

Answer:

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