Answer:
d. to persuade readers to abolish the Atlantic slave trade
Step-by-step explanation:
The purpose by which purpose slave narratives published during Equiano's lifetime is " to persuade readers to abolish the Atlantic slave trade"
This is evident in the fact that Olaudah Equiano's "The Interesting Narrative of the Life of Olaudah Equiano or Gustavus Vassa the African, Written by Himself, " is a slave narrative written in 1789 that described the horrible transatlantic slave trade.
Hence, other slave narratives that were written during this period seek to show how horrible and terrifying the transatlantic slave trade experience.