In which year did the Mongols under Genghis Khan invade Transoxiana in North-East Iran?

1219

The correct answer is Option 1- 1219

The Mongols under Genghis Khan invaded Transoxiana in 1219.

The Mongols, a nomadic tribe from the steppes of Central Asia, led by the formidable Genghis Khan. By 1219, Genghis Khan had already established a powerful military force and was actively expanding his empire.
The Mongol invasion of Transoxiana in 1219, a region encompassing parts of modern-day Uzbekistan, Tajikistan, Turkmenistan, and Kazakhstan. This region was a flourishing center of trade and culture at the time.
This marked the beginning of a two-year campaign that ultimately brought Transoxiana under Mongol control.