—Could you tell me_________?

—He is in the library．

A．where Simon was

B．where is Simon

C．where was Simon

D．where Simon is

某建筑场地采用CFG桩处理，复合地基承载力特征值需达到450kPa，CFG桩单桩承载力为700kN，桩间土承载力特征值为100kPa，采用等边三角形布桩，桩径为300mm，桩间土折减系数取0.90，按《建筑地基处理技术规范》计算，桩间距宜为（）。

A.1.20m 

B.1.49m 

C.1.60m 

D.1.87m