某建筑场地为松砂，天然地基承载力特征值为100kPa，孔隙比为0.78，要求采用振冲法处理后孔隙比为0.68，初步设计考虑采用桩径为0.5m、桩体承载力特征值为500kPa的砂石桩处理，按正方形布桩，不考虑振动下沉密实作用，据此估计初步设计的桩距和此方案处理后的复合地基承载力特征值，其值最接近（）。

A．1.6m；140kPa

B．1.9m；140kPa

C．1.9m；120kPa

D．2.2m；110kPa

Risk transference nearly always involves______．

A．eliminating risk through beta testing

B．policies and procedures for a response system

C．accepting a lower profit if some activities overrun

D．payment of a risk premium to the party taking on the risk