How many roman emperors ruled during the 50-year period

19.

Explanation:

Beginning with the rule of Maximinus the Thracian, Rome began a five decades period of crisis and fell to decay throughout a long list of Emperors. The years from 235 to 285 CE were marked by a string of brief reigns, usually closing with the violent demise of the emperor. Thirteen of them are believed to have been assassinated.

b) the confederacy had to pay all union war expenses.

i would say b. or c.