Bob alifikiri kwamba kadi zake za Pokemon zilikuwa za kawaida na hazina thamani, lakini alikuwa amekosea kuzizungumzia. Walikuwa nini hasa? 
Choose an answer to this question from the following options:

A: binafsi
B: Maalum
C: nadra
D: kung'aa
E: isiyo ya kawaida
The right answer is C