Some products (such as roads, sewer systems, and railroads) are not adequately supplied by the marketplace acting alone. therefore, choices about building such things are made by

The government

Explanation:

Since the market has no incentive to build roads, sewer systems and railroads to the extent that is necessary for people, then the government is responsible for building such things. This ensures that people are able to have these services in order to live full lives. It also contributes to the growth of the economy, and of foreign investment.

i believe it was ccc - civilian conservation corps

the answer is b. they could veto laws. this statement does not describe the members of the roman senate since the praetor urbanus was the one that could veto laws.