English is a west germanic language that originated from the Anglofresian dialects brought to britiain the 5th to 7th centuries.
Many people would get sick from the pollution that was a product from coal smoke and working, hard, long hours without any form of a break. Plus, since large machinery was relatively new in this time era, they were particularly unsafe and lead to many workplace related accidents and deaths.
The correct option is this: SHE KNEW NOW WHAT MEANT THE DUTIES OF THE HOUSEHOLD, THE HEAVY WORK OF THE KITCHEN.
A topic sentence is a sentence in a paragraph which expresses the major topic or idea that is discussed in that paragraph. A topic sentence can be easily recognized in a paragraph because it is always the opening sentence of the paragraph. The major function of the other sentences in a paragraph is to support the topic sentence.