We can actually deduce here that the topic sentence is: Capital punishment costs the state more money than keeping a person in prison for life.
Topic sentence is seen in expository writing and it is known to be the sentence that usually summarizes the main idea of a paragraph. It usually carries the author's or writer's main idea. Thus, it usually shows the position of the writer in the paragraph. It helps to organize a whole paragraph and makes the message of that paragraph very clear.
We see here that "Capital punishment costs the state more money than keeping a person in prison for life" is actually the topic sentence because encapsulates what the paragraph is actually talking about.
Thus, option D is the correct answer.
Learn more about topic sentence on https://brainly.com/question/5526170
#SPJ1