向CaCl2与盐酸的混合溶液中慢慢滴入Na2CO3溶液，下列图象符合实验现象的是（　　）A、https://bgk-photo.cdn.bcebos.com/doc/pic/item/241f95cad1c8a78646795c166f09c93d70cf5052.jpgB、https://bgk-photo.cdn.bcebos.com/doc/pic/item/cc11728b4710b9125592e0e6cbfdfc0392452252.jpgC、https://bgk-photo.cdn.bcebos.com/doc/pic/item/0b7b02087bf40ad19b77d1fb5f2c11dfa9ecce13.jpgD、https://bgk-photo.cdn.bcebos.com/doc/pic/item/0ff41bd5ad6eddc4fdb4a2e331dbb6fd52663352.jpg