过一个多边形的一个顶点的所有对角线把多边形分成6个三角形，这个多边形的边数为[ ]

A.5

B.6

C.7

D.8

_______ made the parents proud was________ their son had been admitted to a key university.

A．What; because

B．What; that

C．That; what

D．That; because