Man: Are you moving into a new house Need a hand with those boxes Woman: That's OK. I can manage. They look big but aren't very heavy actually.Question: What does the woman mean

A．She thinks the man should have helped earlier.

B．She doesn't need the man's help.

C．She doesn't know the boxes are heavy.

D．She wants the man to help with the boxes.

证券公司自营业务操作中，持有一种权益类证券的成本不得超过净资本的30%。( )