Which of the Following Demonstrates the Concept of Propinquity

Which of the following demonstrates the concept of propinquity?

A) Couples usually do not discover differences in each other's values until 3-5 years after marriage.
B) Most marriages occur between individuals who live in the same area of town as each other.
C) Although most university students believe in love at first sight, it is not a commonly reported experience.
D) The most successful marriages are usually between couples who are approximately the same age.