The correct answer is all of the above.
Josiah Henson (1789-1883) escaped to Upper Canada in 1830 where he established the Dawn Black community and became a leader of the Underground Railroad. His 1849 memoir inspired Harriet Beecher Stowe’s Uncle Tom’s Cabin. Henson’s home is now a museum in Dresden, Ontario.
Reverend Samuel Ringgold Ward (1817-1866) was a well known American political figure before joining the Anti-Slavery Society of Canada (founded in 1851). He had escaped to Toronto from the US where he was wanted for his participation in the Underground Railroad. In Canada and England he continued to speak out against anti-Black racism. He wrote the influential Autobiography of a Fugitive Negro: his anti-slavery labours in the United States, Canada and England (1853).
Harriet Tubman (1820-1913) was born into slavery but found a way to freedom in 1849 when she escaped alone from a plantation to the free state of Pennsylvania. Tubman escaped to St. Catharines in Upper Canada, a 'terminus' in the underground railroad. From this base, she would return south many times to guide and give instruction to others -- some of which was communicated through coded song lyrics. "The Promised Land" was said to be Upper Canada and the "drinking gourd" the Big Dipper constellation.