The suggestion we should have a discussion on this problem is not the one he made. A. that

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(答案→)A. that, /
B. /, which
C. which, that
D. which, /
解析：考查句子结构，第一空是同位语从句，作suggestion的同位语，从句中不缺少成分，
因此选择that，第二空是定语从句，先行词是the one，在从句中充当make的宾语，选择that或者which
或者省略，因此选择A