若被保险人遭受部分残疾后不得不从事更简单的工作,月收入下降了一半,则保险公司应定期支付( )元收入保险金。

A．how to hide the fact that he or she is adopted
B．when the child was born exactly
C．whether they should tell the child that he or she is adopted
D．if the child has certain disease

A．①②③④⑤
B．①②③④⑥
C．①②③④
D．①②③⑤