The best answer to your question is B: it will have no effect because the order in which ingredients are mixed will not change the fact that matter cannot be created nor destroyed.
The mass of the batter is determined by the total mass of all the ingredients combined, regardless of the order in which they are mixed. Although the texture and viscosity of the batter may change depending on the mixing order, the total mass will remain constant as long as all ingredients are included. Therefore, mixing the liquid ingredients first or the dry ingredients first does not affect the final mass of the batter.