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(B) Statement $(i)$ is correct: The photoelectric effect is an instantaneous process with no time lag between light incidence and electron emission.St

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$(i)$ and $(iii)$ only

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(B) Statement $(i)$ is correct: The photoelectric effect is an instantaneous process with no time lag between light incidence and electron emission.Statement $(ii)$ is incorrect: The number of photoelectrons ejected is directly proportional to the intensity of the incident light.Statement $(iii)$ is correct: Alkali metals like $K$, $Rb$, and $Cs$ have low work functions and exhibit the photoelectric effect even with visible light.Therefore, statements $(i)$ and $(iii)$ are correct.

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