The sound of a hard c (which often precedes the non-front vowels a , o and u ) is that of the voiceless velar stop, [k] (as in car) while the sound of a soft c (typically before e , i and y ), depending on language, may be a fricative or affricate. In English, the sound of soft …
The one that would not contribute to the structure of Longfellow’s poem would be repetition of phrases. So, C.
Write for your reader, not yourself.
Use pronouns when you can.
State your major point(s) first before going into details.
