Three stacks containing equal numbers of chips are to be made from 9 red chips, 7 blue chips，and 5 green chips．If all of these chips are used and each stack contains at least 1 chip of each color, what is the maximum number of red chips in any one stack ？（）

A．7

B．6

C．5

D．4

E．3

期货公司向客户收取的保证金，属于客户所有，下列（）情形不可划转。

A.依据客户的要求支付可用资金

B.缴纳风险准备金

C.为客户交存保证金，支付手续费、税款

D.国务院期货监督管理机构规定的其他情形