What was the decisive factor in the north's success in the final years of the war?

According to the biography of harriet tubman you read, what physical trauma did harriet tubman experience as a young girl? a.) she was repeatedly raped by an overseer.b.)she lost the use of her left leg after it became stuck in a cotton gin.c.)she was beaten within an inch of her life by a slaveholder which caused her to suffer from memory lapses later in life. d.)she was hit in the head with a 2-pound iron weight by an overseer, which caused her to suffer from narcolepsy later in life.