The correct option is C stroma of chloroplast
The biosynthetic phase of photosynthesis is the step at which the synthesis of glucose molecules takes place by fixing carbon dioxide molecules. The biosynthetic reaction or the light independent reaction takes place in the stroma of chloroplast. Inside the chloroplast, the space with homogenous fluid is called stroma.
All the light dependent reactions occur in thylakoids.
Cellular respiration occurs in mitochondria.