a matter about which there may be disagreement or confusion
about which是定语从句还是
about介词+which名词性分句
提问之前你应该自己先想一想。which要么是限定词,要么是代词。限定词which后接名词;代词which在从句中作主语、宾语或表语。本句中which后接there,可以排除which为限定词,故which为代词。disagreement or confusion是there存在句的主语,即该从句which唯一可作的成分就是介词about的宾语。也就是说可以排除about+which名词性从句这种分析。从句结构为about which引导的定语从句。
同时你还需要逻辑分析,这是你常忽略的内容。逻辑分词很容易看出这是定语从句。
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a matter about which there may be disagreement or confusion
= a matter which there may be disagreement about or confusion about
【说明】disagreement about ... 对 ...... 的意见不一;confusion about ... 关于......的困感;对 ......感到费解
which是引导定语从句的关系代词,在从句中作介词about的宾语,如果不把 about 放在从句开头,可以把 which 省略。