Drama is the specific mode of fiction represented in performance: a play, opera, mime, ballet, etc, performed in a theatre, or on radio or television.[1] Considered as a genre of poetry in general, the dramatic mode has been contrasted with the epic and the lyrical modes ever since Aristotle's <em>Poetics</em> (c. 335 BC)—the earliest work of dramatic theory.
Based on the given sentences above, the one that is punctuated correctly is the second sentence: She sends an email therefore, to her instructor and advisor. What makes the first sentence incorrect is that, it has no period at the end of the sentence. Hope this answer helps.
