Answer:
A. Brutus wants to assure Portia that he will confide in her as soon as he can safely do so.
Step-by-step explanation:
In Act 2, Scene 1 from Shakespeare's "Julius Caesar," Brutus has been planning Caesar's murder and meeting with the conspirators for some time now. Portia notices how strange Brutus has been acting, so she insistently requests him to tell her what is the matter with him, but since Brutus wants to protect her, he keeps her out the conspiracy, falsely promising her that he will let her now what the matter is later.