This passage mainly tells that being unemployed is not all bad.

A．In the eighteenth century.
B．In the early nineteenth century.
C．In the late nineteenth century.
D．In the early twentieth century.

A．It is clearly the best of the projects discussed.
B．It is a good project that could be copied in other cities.
C．The extensive use of bulldozers made the project unnecessarily costly.
D．The work done on the river was more important than the work done on the buildings.