Concept:The basic economic questions are answered according to the economic system a society operates.
Explanation:Every society must decide what to produce, how to produce, and for whom to produce.
These decisions are not made by a single group alone, such as the government or labour unions.
Instead, the answers depend on the kind of economic system practised in that country.
For instance, a market economy answers these questions through consumer demand and private firms.
A planned economy answers them through central government decisions.
Thus, the economic questions are solely answered by the system of economy practised.
Answer:D. system of economy practised.