They are called bustees, jhunggi, and chawl. they occur in all of the major cities of south asia. what are they?

Slums are called bustees, jhunggi, and chawl. They occur in all major cities of the southern part of Asia. In south Asia's fast-growing major cities, a large part of the population are slum dwellers. They experience problems of flooding and scarcity of resources. 

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.