In a Longitudinal Study of Cognitive Functioning Among Bilingual and Monolingual

In a longitudinal study of cognitive functioning among bilingual and monolingual patients with MCI and AD at the Sam and Ida Ross Memory Clinic in Toronto, Bialystak-Stak and colleagues found: :

A) Greater severity although later symptom onset among bilinguals .
B) Greater severity but similar symptom onset among monolinguals .
C) Delayed symptom onset of six years among bilinguals .
D) Less severity with earlier symptom onset among monolinguals .