B) oxygen is oxidized.
Further explanation
Given
photosynthesis reaction
6CO2 + 6H20 ⇒ C6H12O6 + 602
Required
the oxidation compound
Solution
Oxidation-reduction reactions or abbreviated as Redox are chemical reactions in which there is a change in oxidation number
Oxidation is an increase in oxidation number, whereas Reduction is a decrease in oxidation number.
In the photosynthetic reaction, oxidation and reduction reactions occur in:
CO2 to C6H12O6 : reduction
Oxidation number of C from +4 to 0
H2O to O2 : oxidation
Oxidation number of O from -2 to 0