Refer to the given figure and select the correct statement regarding it.
A P is selectively
permeable whereas S is freely permeable to small
molecules.
B Q contains the green pigment molecules and is
the site of dark reaction during photosynthesis.
C R is a green coloured, agranular substance where
dark reaction takes place during photosynthesis.
D R is the site of dark reaction whereas Q is the site
of light reaction during photosynthesis.