Final answer:
The distribution of goods, services, and incomes in a market economy is primarily addressed by the economic question 'For whom to produce', which reflects who will receive these products based on their ability to pay. The correct option is c.
Step-by-step explanation:
The question about the issues of the distribution of goods and services and incomes in a competitive market system refers to the fundamental question "For whom to produce". This question addresses who will receive the goods and services that are produced in an economy.
In a market economy, this distribution is largely determined by the consumers who can afford to buy the products, which is a function of the supply and demand mechanism.
On the other hand, in a command economy, these decisions are made by the government. Fundamentally, this question of distribution reflects societal values and priorities, and different economic systems will approach this issue in various ways. The correct option is c.