Can someone explain what an infinitive is and give me an example? the best answer will be marked the brainliest!

Exit in which of the following passages from the text is the author's motif of displacement and separation most evident? a. "in these ways it was a typical wartime departure, full of proud smiles and half-concealed worry." b. "it upheld the army's decision to limit the movements of a racially select group of citizens." c. "once the first year's turmoil cooled down, the authorities started letting us outside…" d. "if anything made that country habitable it was the mountains themselves…"

How are the two arguments made in the passages different? a. the first passage claims that pets in class will children with health problems; the second passage says pets will make some health problems worse. b. the first passage claims that students’ nervousness will decrease around pets; the second says that students’ nervousness will increase around pets. c. the first passage claims that pets will make the teacher’s work easier by keeping students busy; the second passage says pets will make the teacher’s work harder. d. the first passage claims that pets in school will be good for kids’ mental health; the second passage says pets will be bad for kids’ mental health.

Lines 47–56: determine the central idea of these lines