Me pls what does the word revolution in this sentence most likely refer to?

we have not, here and now, to deal with the history of this revolution, nor with its vast importance for the present and the future.

a. philosophy or belief system

b. violent insurrection

c. dramatic change

d. full turn or rotation

Aword that characteristics of both a verb and a noun

Which sentence best contrasts two things? a. air travel, like bus travel, is a fun way to get from one place to another. b. air travel is a fun and relatively easy way to get from place to place. c. both bus travel and air travel require substantial planning. d. air travel is much more expensive than bus travel.

In the sentence above, which verb is the irregular verb? a. laid b. warmed c. removed d. walked