The best way to write the stage directions is option b. Martha (looking bewildered and taking a long pause before speaking) Josh. What can I say about Josh?
Stage directions are the instructions or information about a scene of a play. These stage directions are included in the script to tell how the actors will enter or act, what is to happen to them in the scene, how to behave, etc.
Thus, the correct way of writing the stage direction for Martha's shy demeanor is option b.
Learn more about stage directions here:
brainly.com/question/15204192