The process that requires sunlight is:
D. Light dependent reaction
The light-dependent reactions occur in the thylakoid membranes of chloroplasts and directly utilize sunlight to produce energy in the form of ATP and NADPH, while splitting water molecules to release oxygen.
The other processes listed (Calvin Cycle, Glycolysis, and Krebs Cycle) do not directly require sunlight. The Calvin Cycle, for example, does not need light directly, but it typically occurs in the presence of light as it relies on the ATP and NADPH generated by the light-dependent reactions.