Answer:
A. cross-cultural research
Step-by-step explanation:
Most commonly, cross-cultural research involves comparing certain cultural features (or trait relationships) along a sample of communities.
The most essential thing to remember is that societies change with time, for each culture, most cross-cultural comparisons need to focus on specific timescales.
The choice of focus also depends on the subject of study.
For example, if you really want to learn about pre-colonialization characteristics, you may be able to choose the earliest timescales.