Even Though Plants Cells Carry Out Photosynthesis, They Still Use

Even though plants cells carry out photosynthesis, they still use their mitochondria for oxidation of pyruvate. Under what conditions will plant cell mitochondria be active in this process?

A) Only in photosynthetic cells in the light, while photosynthesis occurs concurrently.
B) Only in cells that store glucose in the form of starch and only in the dark.
C) In all cells, with or without light.
D) In photosynthesising cells in the light, and in other cells in the dark.