What condition most contributed to disease spreading in tenements in the early 1900s?

Overcrowding

Overcrowding was most directly contributed to the spread of disease in city tenements in the early 1900Explanation:

  the common sense as a pamphlet written by thomas paine. it promoted the independence of the colonies from british rule. the distribution of this pamphlet was great, it reached people everywhere and it was even read aloud at places people met. it also unite the colonists before the revolutionary war.

answer is d

answer; /// i believe the correct answer is (oasis)