— How about going hiking this weekend?

— Sorry, I prefer       rather than      .

A．to stay at home; go out

B．to go out; stay at home

C．staying at home; go out

D．going out; stay at home

当期货合约愈临近交割日时，现期价格与期货价格渐趋缩小。这一过程就是所谓（）现象。

A.转换因子

B.基差

C.趋同（收敛）

D.Delta中性