A formal and conscious development of the language, usually obtained through explicit rules. Acquisition is the informal and spontaneous development of the second language, usually obtained through real life situations without conscious effort.
B informal and conscious development of the language, usually obtained through implicit rules. Acquisition is the informal and spontaneous development of the second language, usually obtained through real life situations without conscious effort.
C informal and spontaneous development of the second language, usually obtained through real life situations without conscious effort. Acquisition is the formal and conscious development of the language, usually obtained through explicit rules.
D formal and conscious development of the language, usually obtained through explicit rules. Acquisition is the formal and not spontaneous development of the second language, usually obtained through real life situations without conscious effort.