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答案：
C
本题中的Dir
ector可能只在K，也可能只在R，也可能KR都在。
设只在K公司的Director有K人，只在R公司的有R人，两个公司都在的有B人，求B。
单独看条件(1)，K和X的联合会议无人缺席的情况下有17人，这其中有只在K的、只在R的和两个都在都都有，可列式K+R+B=17。不知道其它条件的情况下不可求B，单独条件(1)Insufficient；
单独看条件(2)，K有12个Director，这其中有只在K的，也有两者都在的，同理R有8个Director这其中也有只在K的，也有两者都在的，可列式：K+B=12; R+B=8。不知道其它条件的情况下不可求B，单独条件(2)Insufficient；
条件(1)(2)Together：B=12+8-17，可求。条件(1)(2)Together Sufficient。
综上，选C。 
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