Answer:
Cassius Jealousy
Explanation:
Cassius is jealous of people with more power than him and wants Caesar dead. Due to his envy he conspired and is telling people to go against Caesar. His jealousy leads to the assassination of Caesar and to make this act seem noble he has pulled Brutus into the act because everyone loves noble Brutus.
Noun, verb, adjective, adverb, pronoun, preposition, conjunction, and interjection.
A. The sentence works fine. one could argue B, but a colon is used to separate a run-on or show two complete thoughts in the same sentence, so arguably B would not work either.