The correct option is B It is impermeable and lacks porins
Chloroplast is a double membrane bound organelle having an inner and outer membranes. It is selectively permeable, having carrier proteins for transport.
The space covered by the inner membrane of the chloroplast is called the stroma.
A number of organised flattened membranous sacs called the thylakoids are present in the stroma. Thylakoids are arranged in stacks like the piles of coins called grana. The membrane of the thylakoids enclose a space called a lumen.
The stroma of the chloroplast contains enzymes required for the synthesis of sugar and proteins. It also contains small, double-stranded circular DNA molecules and ribosomes.