Judging from context clues in the chapter, and the historical information you were given, hull-house is called a "settlement house" because
a. it is where immigrants settled
b. it settled debts for the immigrants in the neighborhood
c. it offered services to the immigrants who settled in the neighborhood
d. it offered a resting place and services for immigrants planning to settle out west

Hull House is called a "settlement house" because it offered services to the immigrants who settled in the neighborhood (C).

Hull House was founded in 1889 by Jane Addams and Ellen Gates Starr. The main purpose was to provide social and educational opportunities to working-class people, primarily immigrants, in urban Chicago. It was also used to host clubs and labor unions.

d is the best answer for this question.