Hello. You have not informed us which article this question refers to, which makes it impossible to answer with precision and specificity. However, the quantitative format called Causal-Comparative would be a very appropriate format for an author to use to clarify the argument about the problems of a tenement.
This is because this type of quantitative format would allow the author to show and establish a relationship between the causes of the problems and how it affects the environment and the population.