Answer:
Option C: The senate believed he wanted to end the republic
Step-by-step explanation:
Caesar had been recently named “dictator in perpetuity” of the Roman Republic. Ongoing tensions between Caesar and the Senate, amid fears that he plans to claim the title of king, overthrow the Senate and rule as a tyrant, were the principal motives for his assassination.
Caesar was killed because the conspirators wanted to halt the growth in his power and to prevent him from becoming king and destroying the Roman Republic.