A lysosome is a membrane-bound organelle found in nearly all animal cells. They are spherical vesicles which contain hydrolytic enzymes that can break down many kinds of biomolecules.

Point out the erroneous conclusions in the following statements ( ) A: The acid effect of complexing agent reduces the stability of complex B: The hydrolytic effect of metal ions reduces the stability of the complex C: The auxiliary complexation effect reduces the stability of the complex D: All kinds of side reactions are not conducive to the occurrence of the main reaction of complexometric titration