Which<br/>of the following reactions can occur in tropane alkaloids?() A: vitali<br/>reaction B: complexation<br/>reaction C: coordination<br/>reaction D: precipitation<br/>reaction E: condensation<br/>reaction

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