From the following paragraph, it can be said that the last sentence about the difference between the major advances in car safety from year to year is the topic sentence. Thus, option D is correct.
A topic sentence is the phrases and words that in the passage express the main theme or the idea that the writer wants the readers to understand.
It usually summarizes the main thoughts from the passage. Here in the passage, the main idea about the advancement in-car technology is expressed that are majorly related to the safety features.
Therefore, option D. the major car safety advancement is the topic sentence.
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