you may have , you should gather your courage to face the challenge .
A. However serious a problem
B. Whatever serious a problem
C. However a serious problem
D. No matter how a serious problem
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(答案→)A. However serious a problem
B. Whatever serious a problem
C. However a serious problem
D. No matter how a serious problem
解析：考查让步状语从句。本题的让步状语从句是由“特殊疑问词+ever”组成，本句中的特殊疑问词是how，该词所修饰的形容词或者名词要紧跟在how的后面，然后再接所修饰的成分。故A正确。而What后面要接名词或者代词。句意：无论你也许遇见什么样的问题，你都应该鼓起勇气去面对它。故A正确。