Which of the following statements about the Calvin cycle is correct? please !

The Calvin Cycle represents the major pathway of carbon fixation in all photo-autotrophic organisms.
 Which of the following statements about the biochemistry of the Calvin Cycle is correct?
1. It takes three turns of the cycle (3 CO2 molecules) to generated one molecule of glyceraldehyde phosphate.
 2. The reductive phase of the cycle involves the oxidation of NADPH, and results in an increase in the free energy of the carbon substrates.
 3. Without the regeneration of ribulose 1,5,bisphosphate (RuBP), the cycle will stop.
 4. The carboxylation reaction results in the synthesis of one three-carbon molecule

  A.1, 2 and 3   
  B.1 and 3   
  C.2 and 4   
  D.4 only   
  E.All of 1, 2, 3 & 4 are correct