Final answer:
The preface to "Mary Prince: The History of Mary Prince" was written by Thomas Pringle, an abolitionist who edited the narrative, which played a role in the anti-slavery movement in Britain.
Step-by-step explanation:
The preface to "Mary Prince: The History of Mary Prince" was written by Thomas Pringle, not by any of the options provided in your question (Mary Prince, Thomas Hardy, Mary Shelley, or Thomas Babington Macaulay). Thomas Pringle was an abolitionist and the editor of Mary Prince's narrative, which was first published in 1831.
The narrative is a powerful and poignant first-person account of Mary Prince's experiences as a slave in the West Indies, and its publication was instrumental in the anti-slavery movement in Britain.
The preface to 'Mary Prince: The History of Mary Prince' was written by Thomas Babington Macaulay.
Thomas Babington Macaulay was a British historian and politician who is known for his extensive writings on English history.
Therefore answer is a) Mary Prince.