“Bilingualism” is the ability of the brain to :

Correct option is B

manage two languages at will and negotiate many social and cultural contexts using
executive control
"Bilingualism" is the brain's ability to manage two languages at will and negotiate many social and cultural contexts using executive control. This definition encapsulates the cognitive aspect of bilingualism, highlighting the brain's executive functions like attention, problem-solving, and switching between languages as per the context. It encompasses not just the subconscious management of languages but also the conscious, deliberate use and switching between languages in various social and cultural settings.