The answer is going to be C) because
A)We know that she put all three boxes in the window and let them sat their for a hour
B)We know that the boxes are the same size
C)She used three different materials,and she wants to measure the warmth of each box. To see which one is the warmest
D)She never said anything about mass
Hopes This Helps:)
C, fluorine. It will burn anything including concrete, already burnt material, etc.
https://www.youtube.com/watch?v=ckSoDW2-wrc
