To Test Whether Elephants Have a Conscious Self,researchers Marked an "X

To test whether elephants have a conscious self,researchers marked an "X" on the top of an elephant's trunk with white paint and placed a large mirror in front of the animal.Which action demonstrates that the elephant experiences self-consciousness?

A) The elephant touches the mirror with its trunk.
B) The elephant touches the white "X" on its reflection in the mirror.
C) The elephant touches the white "X" on itself.
D) The elephant trumpets when it sees the white "X" in the mirror.