why did it take so long for working class people to fight for improved conditions?\nworkers were simply…

Brief Explanations:

在工业革命时期，工人阶级长期未争取改善条件。“Workers were simply grateful to have a job and a place to live.”（工人仅仅因有工作和住所而感恩）不符合历史事实，工人并非仅满足于此；“Workers accepted that industrialization brought problems.”（工人接受工业化带来问题）表述不准确，工人是希望改变问题的；“Workers were too tired from their jobs to protest.”（工人因工作太累而无法抗议）不是主要原因；而“Workers had no power to make their voices heard.”（工人没有权力让自己的声音被听到）符合当时工人阶级在政治、经济等方面处于弱势，缺乏有效途径和力量去争取权益的历史背景。

Answer:

Workers had no power to make their voices heard.