The answer would be a. because of the sounds of the o and r. According to Poe, o is an ominous sound one can make and not has any negative connotation of it's own so if combine with or sound it does create depression and melancholy.
In "The Philosophy of Composition," Poe talks about the way in which he was able to create his poem "Nevermore." Poe talks about the way in which he developed the famous refrain, and he says that he first decided to have a very short refrain in order to make it easily applicable throughout the poem. He then tells us that the word itself was chosen because of the sounds it contains. Poe considered "o" to be the "most sonorous vowel," and "r" to be the "most producible consonant." This eventually led him to the use of the word "nevermore."
Congress reapportion house seats among the state every ten years by the census that is taken to decide what states gain representatives and what states lose representatives.