Question

correct the text by inserting one comma. (note: in this skill, serial commas are not optional)
1
harriet tubman, a former slave who led more than three hundred people to freedom through the underground railroad, is buried in auburn new york.

Explanation:

A comma needs to be added after "Auburn" to separate the city from the state name, which is a standard rule for formatting place names in English. The existing comma after "Tubman" correctly sets off the non-restrictive clause that describes her, and the required additional comma clarifies the location structure.

Answer:

Harriet Tubman, a former slave who led more than three hundred people to freedom through the Underground Railroad, is buried in Auburn, New York.