Christopher's Mother Is Considering Different Wallpapers for Decorating Christopher's Room

Multiple Choice

Christopher's mother is considering different wallpapers for decorating Christopher's room. She asks him, "Which one do you like better, the striped or the plaid?" Christopher's vocabulary doesn't include the word plaid, but he's able to figure out what the word must mean based on the context. Christopher is using _____ to add a new word to his vocabulary.

A) lexical addition
B) categorical embellishment
C) vocabulary expansion
D) fast-mapping