Japan has left all the available options on the table to respond if recent "excessively volatile" yen movements continue, its top currency diplomat said Thursday, after the currency plunged to a 24-year low against the U.S. dollar.Masato Kanda, vice finance minister for international affairs, said the yen's recent fluctuations are "extremely concerning." The remark came after a tripartite meeting among officials from the Finance Ministry, the Bank of Japan and the Financial Services Agency."If such (yen) moves persist, the government is ready to take necessary action in the foreign exchange…READ FULL ARTICLE