Which code segment should you use?

You are developing a Windows Store app by using JavaScript. The app persists a list of restaurants in
the app’s settings. The restaurant list is identified by a key of city. The app must allow users to
remove their restaurant lists from the app’s settings. The following function call removes the city
setting:
deleteListSetting(“city”) ;
You need to remove only city from the settings storage without disrupting other settings.
Which code segment should you use?

A.
Option A

B.
Option B

C.
Option C

D.
Option D