With Respect to Acquiring a Second Language, the Distinction Between

With respect to acquiring a second language, the distinction between "social communication" and "academic language proficiency (CALP) " is that

A) it usually takes 2?3 years to acquire social language but 5?7 to obtain CALP.
B) it usually takes 1 year to acquire social language but 2?3 to obtain CALP.
C) it usually takes 1?2 years to acquire social language but 3?4 to obtain CALP.
D) there is minimal difference.