在市场分割理论中，如果短期资金市场供需曲线交叉点利率高于长期资金市场供需曲线交叉点利率，则利率期限结构呈现向上倾斜的趋势。( )

It is believed that this stamp is________; all others like it have been lost or destroyed. [ ]

A. unique  

B. vague  

C. potential  

D. arbitrary