What Is the Difference Between Stratification and Differentiation

What is the difference between stratification and differentiation?

A) Differentiation is based on different social statuses, stratification is never based on statuses.
B) Differentiation is not necessarily unequal, but stratification is.
C) Stratification develops in many groups and organizations, but differentiation is less common.
D) Stratification exists in modern societies, and differentiation existed in previous societies.