Which of the Following Describes Both the Olmecs and the Vedic

Which of the following describes both the Olmecs and the Vedic people during the first millennium BCE?

A) Domesticated animals permitted long-distance trade networks to become very active.
B) Cultural cohesion was achieved through tiered social ranks.
C) The absence of monumental cities indicated a lack of wealth.
D) Frequent long-distance communication allowed various societies to share technology.