Stocks Slump on Higher Oil, Fannie Mae  NEW YORK (Reuters) - Stocks fell sharply  on Wednesday  after oil prices jumped more than a dollar and a U.S.  government review questioned home finance company Fannie Mae's  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=FNM.N target=/stocks/quickinfo/fullquote"&gt;FNM.N&lt;/A&gt; accounting methods.