Why is it difficult to measure how many enslaved people were liberated through the underground railroad?
select the best answer from the choices provided.
a.
the organizers who kept the records were discovered and jailed, and their records were destroyed.
b.
the underground railroad was a loose organization of abolitionists who kept no records to preserve secrecy.
c.
the quakers and free african americans who operated the underground railroad could not write.
d.
enslaved people who recorded their journeys left the records in canada, where they were later destroyed.