Select the appropriate word form: Her ______ about ancient history led to a groundbreaking discovery.
答案解析
**Core Concept:** Word formation (词性转换).
**Analysis:** The noun form 'curiosity' is required after the possessive pronoun 'her'. Option A is an adjective. Option C is an adverb. Option D ('curiousness') is grammatically possible but not the standard noun form for this context.
正确答案：B