Final answer:
The sentence in option B presents the stated main idea that workers in industrial cities had little choice but to accept low-paying and hazardous jobs due to the need for wages and lack of organization to demand better working conditions.
Step-by-step explanation:
The sentence in the passage that presents the stated main idea is option B: "Because they needed wages to live, and because they were not organized to demand better working conditions, workers had little choice but to take whatever work they could find." This sentence highlights the main idea that workers in the new industrial cities were compelled to accept low-paying and hazardous jobs due to their need for wages and lack of organization to demand better working conditions.