Which of the following trees has the hardest wood?

Jatoba (Hymenaea courbaril) is also known as courbaril, jutahy and South American locust. It grows in Central America, South America and the West Indies. Most of the jatoba sold in the United States comes from Brazil. The trees reach heights of 70' to 125' with trunk diameters of up to 6' wide.

It is one of the hardest exotic hardwood flooring materials available, ranking over 2800 on the Janka Hardness Scale (twice that of oak),

While often found as flooring, Jatoba is used for furniture, tool handles, turned objects, and in shipbuilding. It's a common wood so pricing is relatively inexpensive and predictable, with supplies plentiful in most common sizes.