Answer:
A) Require that the actors speak with Scottish accents
Step-by-step explanation:
In this way, the play will feel more authentic and real, allowing the audience to immerse in the story. It is suposed to be located in Scotland, so naturally the characters should speak with Scottish accent. As the director wants to stage a "modern interpretation", the actors should wear modern clothes; remember that noblility still exists in that country.
The play needs to be set in Scotland, not New England or the U.S. Congress, that wouldn't have a lot of sense. It is important that a play like this respects logic, things need to be linked in a logical way so the story can easily flow.