What is the effect of doubling the photon flux of light on whether electrons will be emitted from a metal?

A. Light with greater photon flux is more likely to cause electrons to be emitted than the weaker light.
B. Light with greater photon flux will cause electrons to be emitted with faster velocities than the weaker light.
C. Light with less photon flux must shine for a longer time to cause electrons to be emitted.
D. The photon flux has no effect on whether electrons are emitted or not.

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