Recent modifications of Piaget's research have indicated that children may develop less globally than Piaget originally theorized. These studies suggest that children's reasoning is dependent on their general level of development, as well as

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 !

answer; conditional stimulus will trigger a conditioned response;

answer; /// the above statement is (true);