The correct answer is option (C):
singer : song
The correct answer is singer : song.
The relationship in the original word pair, Orator : Speech, is that an orator is someone who gives a speech. The second word is the product or output of the first word's action.
Looking at the options:
cooker : food - A cooker prepares food, similar to the orator's action.
onlooker : look - An onlooker does the action of looking.
singer : song - A singer performs a song. The second word is the product or output of the first word's action.
error : mistake - An error can lead to a mistake, but the relationship is not as directly aligned as the original pair.
Therefore, the relationship between singer and song is the most similar to orator and speech because a singer produces a song in the same way an orator produces a speech.