What condition most directly contributed to the spread of disease in city tenements in the early 1900s? inadequate lighting. lack of safety features. lack of fire protection. inadequate sanitation

The best and most correct answer among the choices provided by the question is the first choice "inadequate sanitation"

Tenements were most common in the Lower East Side of New York City, some occupants triggered the spread of diseases such as cholera, typhoid, smallpox, due to unsafety sanitation.

I hope my answer has come to your help. God bless and have a nice day ahead!