—Mary was being badly treated when John happened to pass by and helped her out.

—I think it was not a pure ________ but had been well planned. [ ]

A. coincidence 

B. occurrence

C. arrangement  

D. incident

证券公司不得有下列（）的行为。

A.收付、存取或者划转期货保证金

B.为客户从事期货交易提供融资或者担保

C.代客户下达交易指令

D.利用客户的交易编码、资金账号或者期货结算账户进行期货交易