Read the following passage to answer the question below
"In 1860, after a tenement fire took 20 lives, New York City's building laws were extensively revised and strengthened. At that time, the position of "Superintendent of Buildings* was created within the Fire Department to enforce the new structural safety laws. An independent "Buildings Department" in Manhattan was later founded in 1892."
-City of New York Buildings Department
Which of the following was a major factor contributing to the problem addressed in the quotation?
A. the problem of monitoring pollution from urban tenements
B. the mass crowding of city and tenement buildings
C. the problem of sanitation in cities
D. the sudden increase in property crimes