which指代 求NN指点

outsider0214

Scientists say that each of the photographs taken of the Ares Vallis plain by the Mars Pathfinder indicate the overwhelming extent to flooding on the planet billions of years ago and the degree that rocks were scattered by its force.                                    

• Aindicate the overwhelming extent to flooding on the planet billions of years ago and the degree that
• Bindicate that the extent of the floods on the planet billions of years ago was overwhelming and the degree to which
• Cindicate the overwhelming extent of the floods on the planet billions of years ago and the degree to which
• Dindicates the overwhelming extent of the flooding on the planet billions of years ago and the degree to which
• Eindicates the overwhelming extent to flooding on the planet billions of years ago and the degree
  

请教D中的which 指代什么？

KongMeiling

新人菜鸟：是degree吗？