The following detail from the excerpt reveals a change in public attitude during Harriet Tubman's lifetime:
Tubman was buried with full military honors.
The key to answering this question is carefully reading what is being asked. All the other options state things that Tubman did, not how other people reacted towards Tubman. Tubman passed from being a slave who was looked down upon by many, to being a woman widely known and praised for her deeds. This is reflected in how she was buried, by burying her with military honors they were honoring her life.