Your answer would be A, that I borrowed from the library
When trying to figure out what an adjective clause is ask the two questions
which and what? So what book? Which book?
Hope this helps :)
➜︎Question
how did African Americans overcome adversity during World War II
➜︎Answer
American Soldiers in World War II Helped Pave Way for Integration of US Military
Gulper eel has a mouth so big it can swallow the Atlantic hagfish.
Answer: 4. . . . they do not rashly engage in war, unless it be either to defend themselves or their friends from any unjust aggressors, or, out of good nature . . .
Explanation: This quote reveals the most important thought that the passage holds about its topic, it summarizes what the text is about. All the other options support this main idea, for example, option 1 and 2 tell us about the people's hatred or opposition toward war, and option 3 tells us that even though they hate the war, they prepare themselves in case it happens. Finally, option 4 sums up those ideas and gives us the most important thought: the people do not engage in war easily, except in certain circumstances.