Witch change in a gene pool is occurring in the image below?

I’m pretty sure gene mutation but not sure.

A. Gene mutation
B. Gene flow
C. Genetic drift
D. Genetic resistance

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Answer is: the equilibrium  shifts toward the reactants, to the left side of chemical reaction.it is because lead(ii) nitrate dissociates in water: pb(no₃)₂ → pb²⁺(aq) + 2no₃⁻(aq).according to lechatelier's principle, the position of equilibrium moves to counteract thechange (more lead cations, common ion), the position of equilibrium will move so that the concentration ofproducts decrease and concentration of reactants of chemical reaction increase.read more on -

The name for subatomic particles in an atom is called a proton

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