Science P6 NHPS 2018 SA1 Q23

Linda has 3 sheets made of different materials as shown below.She first placed sheet X in between a light source and a datalogger. The datalogger is used to detect the amount of light that passes through the material. She then repeated this with sheets X and Y attached together and then finally, with all 3 sheets X, Y and Z attached together as shown below.Which one of the following shows the most likely result of her experiment?