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.