The correct option is C Hatch & slack
D.I. Arnon demonstrated how energy from sunlight is used to form adenosine triphosphate.
Calvin proposed the C3 cycle or the Calvin cycle along with James Bassham and Andrew Benson.
Hatch and slack discovered the C4 cycle.
Robin Hill proposed the Hill reaction, which demonstrates that oxygen is produced in plants in a process that is separate from the process that converts carbon dioxide (CO2) to sugars.