Answer:
a. He was willing to disobey the direct orders of the Senate.
Step-by-step explanation:
Julius Caesar's Rubicon River crossing occurred in 49 BC. This action was against the order of the Roman Senate, who had ordered Julius Caeser not to march with his army across the Rubicon River. However, Julius Caeser went against the order of the Senate. An action which was later termed as treason. On his way, he declared "The die has been cast."
Hence, in this case, the correct answer is option A: He was willing to disobey the direct orders of the Senate.