The correct option is D Occurs in Kranz anatomy, where mesophyll cells have small chloroplasts whereas bundle sheath cells have agranal chloroplasts
Hatch and Slack pathway is the other name for C4 cycle, named after the discoverers. C4 plants have a characteristic feature called as Kranz anatomy in mesophyll. They have small chloroplast in mesophyll, whereas agranal chloroplast in bundle sheath.