When was Mona Lisa painted by Leonardo da Vinci?

The correct answer is C. 1504 AD.

Leonardo da Vinci began painting the Mona Lisa in 1504 and worked on it intermittently until his death in 1519. The painting is a half-length portrait of a woman whose expression is both enigmatic and alluring. The Mona Lisa is one of the most famous paintings in the world and is considered to be a masterpiece of Renaissance art.

Option A is incorrect because Leonardo da Vinci was born in 1452.

Option B is incorrect because the Mona Lisa was not painted in 1492.

Option D is incorrect because the Mona Lisa was not painted in 1556.