Respuesta :
Answer:
c. Since James Madison served as president from 1809 to 1817, Dolley Madison was one of the earliest First Ladies.
Explanation:
A clause is a group of related words consisting of at least a subject and a verb. When a clause expresses a complete thought and can stand on its own, it is independent; but when it needs another clause in order to make sense, in other words, when it does not express a complete idea on its own, it is dependent.
Sentence C, therefore, consists of one dependent clause which it's “Since James Madison served as president from 1809 to 1817” (It is a clause that can not stand on its own) and an independent one: “Dolley Madison was one of the earliest First Ladies.”