I think the answer is C, because if they are speaking clearly then people can fully understand what they are saying.
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Declarative Sentences: Used to make statements or relay information. Imperative Sentences: Used to make a command or a direct instruction. Interrogative Sentences: Used to ask a question. Exclamatory Sentences: Used to express a strong emotion.
Muse, Greek Mousa or Moisa, Latin Musa, in Greco-Roman religion and mythology, any of a group of sister goddesses of obscure but ancient origin, the chief centre of whose cult was Mount Helicon in Boeotia, Greece. They were born in Pieria, at the foot of Mount Olympus. Very little is known of their cult, but they had a festival every four years at Thespiae, near Helicon, and a contest (Museia), presumably—or at least at first—in singing and playing.