3. How are maglev trains different from other trains? A. They travel at high speeds.
B. They have a sleek design.
C. They carry fewer people.
D. They don't have wheels.

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 am confused, what is the question? i can you out if you put it into more depth.