A unicellular is a one celled organism and a multicellular is a organism with 2 or more organisms
She's a liar, she led me on on tumblr and dumped me
The correct answer is B. Because a one-word refrain is less difficult than a long refrain.
The refrain in Poe's 'The Raven' consists of one word only because of its brevity (shortness). This is what Poe wrote in his <em>The Philosophy of Composition </em>(a text about how he went about writing this poem):
<em>Since its application was to be repeatedly varied it was clear that the refrain itself must be brief [...] This led me at once to a single word as the best refrain.</em>
They are called "sources"
