Which statement best summarizes the early nineteenth-century revolutions that moved through europe?

Most revolutions were unsuccessful is the correct answer.

Explanation:

The question refers to the Age of Revolution, a period in European history that goes from the late 18th century to mid 19th century. Even though this age spred in the Americas too, this question focuses only in the European part. There were several Revolutionary Wars in Europe, such as the Serbian Revolution or the Greek War of Independence (this last one failed at first but after the Greeks received support from different nations it succeeded.)

the correct answer is

d) rocket launcher

by improved communication.