Question

which was an achievement of the national convention?
it abolished slavery in france and the french colonies.
it released the church from its heavy tax burden and placed more responsibility on the middle class.
it ended the practice of execution by guillotine, which many french citizens objected to.
it exiled the royal family to an island off the coast of france.

Explanation:

The National Convention (1792-1795) during the French Revolution abolished slavery in France and all its colonies via a decree in 1794. The other options are incorrect: it increased taxes on the church, the guillotine was widely used during its rule, and the royal family was executed, not exiled to a French coastal island.

Answer:

It abolished slavery in France and the French colonies.