Which of the following is the balanced chemical equation for photosynthesis?

a.
6H2O + 6CO2   ® 6O2 + C6H12O6
b.
C6H12O6  + 6O2 ® 6H2O + 6CO2
c.
H2O + CO2   ® O2 + C6H12O6
d.
C6H12O6  + O2 ® H2O + CO2