The correct option is A 4
Splitting of H2O:- It occurs in the membrane of the thylakoids. When the chloroplasts (chlorophyll pigment containing plastids) are illuminated with light, 2 molecules of H2O are split into 4H+, 4e− and 1 O2 is released. These electrons are used to replenish the electrons lost from PS II.
The reaction is as follows
2H2O sunlight−−−−−−→chlorophyll 4H++4e−+O2