Cross-Cultural Comparisons Made Using Collections of Ethnographic Data Are Ahistorical

Cross-cultural comparisons made using collections of ethnographic data are ahistorical. This means that

A) the ethnographic descriptions of cultures are treated as timeless and unchanging.
B) the ethnographic information is not dated; there is no record of the years which it covers.
C) they only address nonliterate cultures.
D) their findings would likely not be published by a history journal.