How Would One Ensure That Ethnographic Analogy of Early Tool

Multiple Choice

How would one ensure that ethnographic analogy of early tool use is as accurate as possible?

A) The culture for comparison should be derived from the ancient culture of study.
B) The culture for comparison should be as technologically primitive as possible.
C) The ancient culture should be one for which some historical records are available.
D) The ancient culture should be compared only to other ancient cultures.