The narrator of the frame story in The Canterbury Tales is

Geoffrey Chaucer

The Cook

Thomas à Becket

A pilgrim whose social status is unidentified

The narrator of the frame story in The Canterbury Tales is A: Geoffrey Chaucer.

Explanation:

'The Canterbury Tales' is a compilation of twenty-four stories written by "Geoffrey Chaucer". He is the narrator himself and author of "The Canterbury Tales". He narrates a series of short stories, called frame story. These short stories are joined together by a main story outline. This main story is the general introduction which is summarized.

Chaucer guides us to the action that happens in the story. Sometimes we feel that he has met the pilgrims for the first time and feel that we are with him.