Consider the following statements and identify the correct response from the options given thereafter:
a. The colonies in the Caribbean were important suppliers of tobacco, indigo, sugar and coffee.
b. The slave trade began in the 15th century.
c. French port cities like Bordeaux and Nantes owed their economic prosperity to the flourishing slave trade.
d. Slavery was finally abolished in the French colonies in 1848.
Among the given options correct statements include: