Can you believe his reason for being absent from the class _____ he had to look after his sick mother at home?

A．while                 B．that                    C when                    D．as

关于项目资本金的说法，正确的是（）。

A.项目资本金是债务性资金

B.项目法人要承担项目资本金的利息

C.投资者可转让项目资本金

D.投资者可抽回项目资本金