We want the case to be reopened even if there is the risk ______ it would concern football players. 

A． which

B． what

C． when

D． that

男性，29岁，口腔溃疡反复发作5年，加重半年。查：舌缘右侧各可见一块约1．0～1．2cm的溃疡，边缘不整，表面有灰白色的伪膜。下唇内侧粘膜有条形白色瘢痕。临床应注意与下列哪种疾病相鉴别（）

A.单纯疱疹

B.扁平苔藓

C.白色念珠菌病

D.创伤性溃疡

E.白斑