The correct option is
B F1 particles.
The ATP produced during oxidative phosphorylation by which the electron flow from the electron carrier to the non-hydrogen carrier the H+ in the intermembranous space than in matrix. The protons flow back due to proton motive force by which the energy is liberated by activating ATPase present in F1 head to synthesize ATP.
So the correct option 'F1 particles.'