The correct option is B limited
The word 'extensive' refers to covering or affecting a large area.
Option A, ordinary refers to something with no special or distinctive features.
Option B, little refers to being of a small amount.
Option C, limited refers to something restricted in size, amount or extent.
Option D, restricted refers to being limited in scope, extent or number.
Thus, according to the meaning, the word 'limited' is the opposite of the word 'extensive'.