After Dr. Flint dies, why doesn't Harriet finally feel safe?
a) Harriet has not accumulated enough wages to buy her own freedom.
b) Harriet is superstitious and believes Dr. Flint's ghost may continue his torment by haunting her.
c) Dr. Flint's daughter and son-in-law still have a claim on Harriet.
d) Some politicians in power are sympathetic to Southern slave-owners.