If you are unable to attend the interview, for reason, you should inform us immediately.A

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(答案→)A. whatever
B. what
C. whichever
D. which
解析：各选项词意辨析：whatever无论什么；what什么；whichever无论哪个；which哪个。根据句子意思首先排除B和D。whatever不涉及事物的范围，whichever表示在一定的人或事物中进行选择。题干要表达的意思是“无论哪方面”的原因，不限定范围，帮选择A