12) D
A – Wrong
A is wrong because the text clearly says that the performer who plays the role of Gracie cannot play any other characters.
B – Wrong
B is wrong as the performer who plays Rose also plays Guard 1. This performer cannot play a third role of Teddy as Teddy and Guard 1 are both in scene 1.
C – Wrong
C is also wrong as the as the performer who plays Rose also plays Guard 1. This performer cannot play a third role of Sarah as Sarah and Rose are both in scene 10.
D – Correct
D is correct. Graham and Carl are not together in any of the scenes.
E – Wrong
Sarah is to be played by a female performer and Graham is to be played by a male performer.
F – Wrong
F is also wrong as the as the performer who plays Rose also plays Guard 1. This performer cannot play a third role of Guard 2 as Guard 1 and Guard 2 are both in scene 1.