What did Penn do to encourage low population density?

He designed a city plan with streets wider than any major thoroughfare in London. Moreover, five major squares dotted the cityscape, and Penn wished each dweller had a family garden. To encourage low population density, William Penn distributed land in big parcels. Penn selected a site much carefully.

deseasie in europe              

the graph shows the spread of railways in the 1800s.

based on the graph, the conclusion that can be drawn about germany is answer d)   by 1880, germany had more rail lines than great britain and russia.