I think that is it safe to say (I mean by this: check if it's among your options) that both individual and international trade are voluntary exchange of goods -both parties have to agree on it without being forced to it. Also they should be mutually beneficial - otherwise the two parties would have have agreed!
Answer:
I believe B, Herding and farming.
Most of the research on adolescents has
been carried out with white, middle class samples.
To add, research on
adolescence<span> uses both
quantitative and qualitative methodologies applied to their cognitive,
physical, emotional, and social development and behavior. A popular research that
tackles this can be found in the book, <span>Journal of Research on Adolescence.</span></span>
