Select a suitable topic sentence for this paragraph.

ranchers see bolts flash many times among isolated trees or on a strand of barbed wire. forest rangers manning fire towers report that every thunderstorm brings several flashes to their lofty outposts. lightning rods are a necessity for radio towers and skyscrapers.
lightning rods are essential.
the old saying "lightning never strikes twice in the same place" is not true.
forest rangers have a dangerous job because of repeated lightning strikes.

i suggest it is anadiplosis

a compare and contrast essay is a piece of formal writing in which the author focus on the similarities between two ideas, objects, places, etc., and the differences between them. there are some aspects that the author should take into account when he/she is crafting the essay. first, the author has a clear idea of the effect that he/she wants to produce on the audience (a purpose). his/her main idea should be presented in the thesis statement in a simple but effective way which gives the audience a clear idea of the content and the direction of the essay. in addition, it is also important to focus to the similarities and differences that not only are interesting and relevant to the reader but also provide a new, impressive point of view or deeper understanding of a topic.