Answer
Using higher frequency light will work. See explanation.
Work Step by Step
A. Greater intensity means more photons, but if the frequency is the same, the ejected electrons will have the same maximum kinetic energy. There will just be more of them.
B. Higher frequency light means more energetic photons, so when an electron is ejected, it will have a higher maximum kinetic energy.
C. Longer wavelength light means lower frequency light. This will lower the electrons' maximum kinetic energy.
D. A metal surface with a higher work function clings more tenaciously to its electrons. Any ejected electrons will have a lower maximum kinetic energy.
