下列情况中，哪一种是自信者的表现 [ ]

A．我必须受到所有人的尊敬

B．我必须避免犯任何错误 

C．我必须永远高人一等

D．我要勤奋努力，不甘落后 

— The final exam is coming. I don't think I can pass it though I work hard.   

— Be confident! Even students with ___intelligence can be successful, let alone clever students like you![ ]

A. splendid          

B. average          

C. unusual          

D. popular