Answer:
D. Polysyndeton
Explanation:
Polysyndeton is a literary device in which conjunctions are used repeatedly in quick succession even when they could be omitted. These conjunctions are often not preceded by commas. The purpose of this device is to change the rhythm of the text.
Twain uses polysyndeton twice in the given passage:
Metonymy is a literary device in which something is referred to by the name of something else closely associated with it (e.g. crown instead of the king or queen).
Asyndeton is a literary device in which conjunctions are omitted from a series of related clauses (e.g. I came. I saw. I conquered.)
Polyptoton is a literary device in which words derived from the same root are repeated (e.g. blood and bleed).