The assumption about Robert that is most likely true based on the stage directions is that he regrets a decision he has made because the excerpt indicates that he holds his head in his hands, rocking slightly which is a position that lets you inferred tat the person is upset or sad about something and if you also analyze what he says, for example, that he just wanted to be a good father, you understand that from the options given the one that is true is that he regrets a decision. The other options are positive things that don't go with what the situation expresses.
I am pretty sure the correct answer to this question your looking for would be: C.a static character whose beliefs and behaviors don't change over the course of the story. I hope i helped! :)
