its d bcz adverbs clauses always contains a subject and a verb , and always ans 1 of these 3 ques .when .why .how
The sentence that contains an adverb clause is option C: 'I did not remember that fact until my older sister reminded me.' The phrase 'until my older sister reminded me' serves as the adverb clause. This clause explains when the remembering did not occur, fulfilling the function of an adverb.
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