Answer:
The correct answer will be option B- stroma of the chloroplast.
Step-by-step explanation:
The Calvin cycle or the light-independent reaction is a set of chemical reactions which produces the energy molecule of a plant called sucrose.
The Calvin reaction takes place in the inner space of the chloroplast known as the "stroma". Stroma is the fluid-filled inside the chloroplast which surrounds the grana and the thylakoid.
Thus, option B is the correct answer