Well, it's DEFINETLY not a noun, so A is OUT B. - an adverb is a word that qualifies an adjective, verb, or other adverb word or word group, so that's out too C- a word used to connect 2 simple sentences, so that's out too cos "Eek!" isn't really connecting anything, now, is it? D- it is a word that will express emotion and "pause words" like "um, err, uh?" and is often used at the beginning of the sentence and "sounds" like an exclamation So it is D! "Eek!" is an interjection!
It depends on whether the writer enjoyed that song at the time when he/she wrote the lyrics I guess. There needs to be more proof to be sure that it is one, because it is a pretty common saying. I'd say yes or no to be on the safe side no.
