In the Dark Year of the Raven, 13 men of the court plotted to take the throne of King Hugo. The king grew suspicious when he noticed that the men seemed to disappear at the same time after royal meetings. He sent his loyal foot soldier out to watch over their activities. He found them conspiring together to overthrow the king in an uncompleted workshop. Upon the discovery of the plot against the king, the conspirators were arrested. They were all imprisoned for their involvement for their crimes against the court.
adapted from "Raven's Plot" by Mr. Gore

Using your knowledge of how affixes change the meaning of a word, what is the meaning of the word involvement in the passage above?

A.
removed before
B.
against prison
C.
the act of being involved
D.
not involved