Answer the Question on the Basis of the Following Consolidated

Answer the question on the basis of the following consolidated balance sheet of the commercial banking system.Assume that the reserve requirement is 10 percent.All figures are in billions and each question should be answered independently of changes specified in any preceding ones. $\begin{array}{c}\begin{array}{lll}\quad\quad\quad\underline{\text { Assets}}\\\text { Reserves}\\\text { Securities}\\\text { Loans}\\\text { Property} \end{array}\begin{array}{l}\\\$ 60 \\140 \\260 \\400 \end{array}\begin{array}{lll}\quad\quad \underline{\text { Liabilities \& Net Worth }}\\\text { Checkable Deposits}\\\text { Stock Shares}\\\\\\\end{array}\begin{array}{lll}\\\$600\\260\\\\\\\end{array}\end{array}$
Refer to the given data.Suppose the Fed sold $10 billion of U.S.securities to the banks.This would:

A) increase bank reserves to $70 billion,reduce bank-held securities to $130 billion,and ultimately increase the money supply (checkable deposits) by $100 billion.
B) increase bank reserves to $70 billion,reduce bank-held securities to $130 billion,and ultimately decrease the money supply (checkable deposits) by $100 billion.
C) reduce bank reserves to $50 billion,increase bank-held securities to $150 billion,and ultimately increase the money supply (checkable deposits) by $100 billion.
D) reduce bank reserves to $50 billion,increase bank-held securities to $150 billion,and ultimately decrease the money supply (checkable deposits) by $100 billion.