The Importance of Being Productive, Active, Assertive, and Highly Involved

The importance of being productive, active, assertive, and highly involved with our fellow humans comprises a pattern of living that:

A) has proved to be universal across cultures.
B) has proved to be true of modern times but not so in previous eras.
C) has proved more popular in Western cultures than in many other cultures, historically and in the present.
D) has proved to be the best philosophy for extending one's lifespan.