Which one of the following Federal Reserve monetary policies, when pursued in line with the U. S. government’s fiscal policies, would help increase aggregate demand during a period of high unemployment（）

A. An increase in the reserve requirements for financial institutions.

B. A decrease in the discount rate.

C. An increase in the margin requirements at brokerage firms.

下列金融业务中，有关营业税计税依据的确定，表述正确的是( )。

A．金融机构从事外汇买卖业务，以卖出价为营业额

B．金融机构销售账单凭证、支票，以取得的收入为营业额

C．金融机构将吸收的存款贷与他人使用，以贷款利息减去存款利息的余额为营业额

D．金融机构进行债券转让业务，以买卖债券的价差收入为营业额