The Montgomery bus boycott, sparked by activist Rosa Parks, was an important catalyst for the civil rights movement. Other important protests and demonstrations included the Greensboro sit-in and the Freedom Rides.
What you can learn about a word from its etymology is:
B. word form history
C. root word
D. word components
Etymology is the study of the origin and meanings of a word, as well as of how it has changed over time. Therefore, from etymology, we can learn the original word, or root word, that generated other words we use nowadays. It also shows what components are part of that word. Even though etymology often tells us the time period in which a form of that words was employed, it does not state its year of origin. Therefore, we can eliminate letter A. Options B, C and D are all correct.