法国史学家马克.布洛赫在《为历史学辩护》中指出：“在进行历史研究时，人们往往迷恋于寻找单一的原因，便错误的将原因归结于一个，这样就成为一种价值判断。”他强调历史研究应

A．抓住事务发展的根本原因

B．多角度地认识、考察史实

C．分清历史事件的主次原因

D．以正确的价值判断为起点

TDK commercial bank makes an adjustable rate mortgage for a big construction customer. Which of the following would be an appropriate position for the bank to hedge its risk with this loan TDK should pay:()

A. fixed to a currency swap counterparty and receive variable. 

B. variable to an interest rate swap counterparty and receive fixed. 

C. variable to a currency swap counterparty and receive fixed.