根据下列内容，回答196-198题。

San Francisco has its cable cars. Seattle has its Space Needle. And, Longview has its squirrelbridge. The bridge, which has attracted international attention, is now a local landmark.

The Nutty Narrows Bridge was built in 1963 by a local builder, Amos Peters, to givesquirrels a way to cross the busy road without getting flattened by passing cars.

The original bridge was built over Olympia Way on the west edge of the library grounds.

Before the bridge was built, squirrels had to avoid traffic to and from the Park Plaza office buildingwhere office staff put out a nutty feast for the squirrels. Many times, Peters and others who workedin and near Park Plaza witnessed squirrels being run over.

One day Peters found a dead squirrel with a nut still in its mouth, and that day's coffee breakdiscussion turned into squirrel safety. The group of businessmen cooked up the squirrel bridge ideaand formed a committee to ask the blessing of the City Council. The Council approved, andCouncilwoman Bess LaRiviere named the bridge "Nutty Narrows."

After architects designed the bridge, Amos Peters and Bill Hutch started construction. Theybuilt the 60-foot bridge from aluminum and lengths of fire hose. It cost $1,000.

It didn't take long before reports of squirrels using the bridge started. Squirrels were evenseen guiding their young and teaching them the ropes. The story was picked up by the media, andNutty Narrows became known in newspapers all over the world.

In 1983, after 20 years of use, Peters took down the worn-out bridge. Repairs were made andcrosspieces were replaced. The faded sign was repainted and in July 1983, hundreds of animallovers attended the completion ceremony of the new bridge.

Peters died in 1984, and a ten-foot wooden squirrel sculpture was placed near the bridge inmemory of its builder and his devotion to the project.

What does the underlined phrase "teaching them the ropes" probably means in thetext ?__________

• A.Passing them a rope
• B.Directing them to store food for winter
• C.Teaching them a lesson
• D.Showing them how to use the bridge