Final answer:
When an economy produces more houses and fewer typewriters, it is answering the d. 'what' question.
Step-by-step explanation:
Economic questions explore the allocation of resources to address unlimited wants. They include what to produce, how to produce, and for whom to produce. Factors such as scarcity, supply and demand, government intervention, and market dynamics influence these inquiries, shaping economic policies and decisions at individual, corporate, and societal levels.
When an economy produces more houses and fewer typewriters, it is answering the what question. The what question pertains to what goods and services should be produced in an economy. In this scenario, the economy is shifting its focus from producing typewriters to producing houses, indicating a change in what it produces.