Which of the following experiments confirms that light behaves in a wave like manner?

a)When light has it's frequency adjusted, the speed of the light changes
b)When light is given more energy, it is brighter
c)When light is sent through a series of mirrors, it bends it's way backwards
d)When laser light is sent through two slits, an interference pattern of bright and dark bands appear

I think it's C
Help tell me your opinion

I think it is d)

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