Start with the first blank. The word in the blank should be the opposite of “central.” A good prediction is “peripheral.” Of the words in the blank, the word closest in meaning to “peripheral” is superficial. The clue for the second blank is “even when it’s intended,” which implies that the word in the first blank means “unintended.” Of the words in the choices, the best is incidental. The clue for the last word is “outside of the scope.” Of the choices, the word closest in meaning to “out of scope” is irrelevant.