Brainliest to WHOEVER ANSWERs RIGHT. (if you put a random answer I will report you)
What is the significance of the photoelectric effect?

it gave evidence that light could be either a wave or a particle
the wave nature of light is a probability statement of where photons are going to be
it gave evidence for the particle nature of light
it found that you could form a typical diffraction pattern with either high or low intensity light

As per Huygen's explanation to the theory of light we know that the light shows the phenomenon of refraction, reflection, polarization, diffraction etc

All the above said phenomenon is showing the wave nature of light.

This all phenomenon was experimentally verified and all excepts that light is of wave nature

But after Einstein shows his photoelectric effect to prove that light has particle nature

In this experiment he shows that when light of finite frequency incident upon photo sensitive metal then it ejects out the electron from it.

This is the verification of particle nature of light

so here correct answer would be

B. it gave evidence for the particle nature of light

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