The correct answer is false.
It is false that the Eiffel tower was built during the French Revolution.
The French Revolution started in 1789 and ended in 1799. The Eiffel tower was built by engineer Gustav Eiffel. The works started in 1887 and ended in 1889 to be ready for the big Exposition called "The World Fair of 1889," in Paris, France. The tower is 1,063 feet tall and is one of the most iconic symbols not only in France but in all the world.