B. “Can't see it,” Remarked Rainsford, trying to peer through <em>the dank tropical night that was palpable as it pressed its thick warm blackness in upon the yacht.</em>
Explanation:
Personification is a figure of speech that consists of giving human characteristics to nonhuman things, animals, concepts, ideas, etc. and which is often used to give readers new insights and make the writing more vivid. The line in bold from option B is an example of personification because it describes the “dank tropical night” as if it was a human by giving it the ability to press “its thick warm blackness in upon the yacht.”
Your conclusion gives your reader something to take away that will help them see things differently or appreciate your topic in personally relevant ways. It can suggest broader implications that will not only interest your reader, but also enrich your reader's life in some way.