GMAT Critical Reasoning (CR) | Re: A musicologist doing research in an early music archive in London has

Option D implies that the musicologist is not aware of certain works of Suggs that may or may not match with the song in question. It actually does not matter whether that unknown part of Suggs' work matches with the song - the fact that the musicologist already found similarity with the part of Suggs' work that he knows is not weakened by the dissimilarity (if at all there is) of the unknown part, given that such a song is atypical of other composers.