Which of the Following Situations Is an Example of Subtractive

Which of the following situations is an example of subtractive bilingualism?

A) Maurice grew up in Montreal. He heard a lot of French dialect spoken around him and on the radio, but he only speaks English.
B) Kim heard English and Mandarin from the time she was born. She speaks both languages fluently.
C) Marco learned Spanish as a child growing up in Mexico. He later learned English, moved to California for college, and continued to use his Spanish.
D) Jasmina learned Croatian as a child. When her family moved to Winnipeg, she became fluent in English and eventually forgot her Croatian.