求详细解释SAT语法题：（2010年10月28）

求详细解释SAT语法题：（2010年10月28）
Embarrassment over the discovery of ( element 118,announced with great fanfare and then retracted amid accusations of scientific fraud,has left ) the nuclear physics comminity feeling bruised.
A.element 118,announced with great fanfare and then retracted amid accusations of scientific fraud,has left
B.element 118,which was announced with great fanfare and afterwards which was retracted amid accusations of scientific fraud,has left