Among the educational network’s major innovations was its refusal to take money from commercial advertisers, relying instead on donations from listeners and grants from institutions such as the ford foundation and calling itself listener-supported.

every society, in order to meet the needs of it's people, has to answer three basic questions:

- what should we produce?

- how should we produce it?

- for whom should we produce it?

this questions must be answered in order to, option b, aid in production decisions.

every country can't produce everything, no matter how rich their land is. it may be a matter of technology, resources or geographical conditions. so, these three questions must be resolved in order to get the most of the production of each land.

hope this !

i would say b. research typically uses a variety of sources

answer; archaeologists;