The meaning of the word "cryptic" in the sentence and the answer to the question above is the following one: mysterious. The Cambridge dictionary defines "cryptic" as mysterious and difficult to understand. In addition, it indicates that "inscrutable" is a possible synonym for this word since it means not showing emotions or thoughts and therefore very difficult to understand or get to know. Yet, as you can see, it is a bit different.
The option that best describes the effects of the conflict betweem Brutus and Cassius is option A. It elevates Brutus as the only nobleman. Brutus emerges as the most complex character in Julius Caesar and is also the play's tragic hero.