Crumple means change shape from smooth into compacted by physical force.
Crumple the foil then carefully reopen it.
Foil can be scrunched up by physical force.
What is used to scrunch up foil?
Options:
A. tin
B. awl
C. parchment paper
D. an external framework
E. Physical force
F. energy barrier
G. hard outer covering
H. Evaporation