如图，已知△ABC，分别以A，C为圆心，BC，AB长为半径画弧，两弧在直线BC上方交于点D，连接AD，CD，则有（　　　）  

A、∠ADC与∠BAD相等

B、∠ADC与∠BAD互补                               

C、∠ADC与∠ABC互补

D、∠ADC与∠ABC互余