In his research, George Murdock determined that "though cultures appear to outwardly share many common denominators, the only true cultural universal is trade".
Option: A
Explanation:
Cultural universal is a reality, adaptations to fulfill basic necessities, such as the need for meal, house and clothing. George Murdock, a Polish-born anthropologist, assembled a list of cultural universals involving as below:
G. P. Murdock is known for his analytical approach to ethnological research and his analysis of the systems of family and shared experience through cultures.