Explanation:

- Option 1: 1219

- This is the correct year when the Mongols, led by Genghis Khan, invaded Transoxiana, an area in North-East Iran.

- The campaign was part of Genghis Khan's larger conquest of the Khwarazmian Empire.

- Option 2: 1208

- This year is incorrect regarding the invasion of Transoxiana.

- In 1208, Genghis Khan was consolidating power in the Mongolian steppe.

- Option 3: 1213

- This year does not align with the invasion of Transoxiana.

- By 1213, Genghis Khan was engaged in campaigns in northern China.

- Option 4: 1205

- This year is too early for the invasion.

- Genghis Khan was still establishing his empire in Mongolia around this time.

Your answer is Option: 1 - 1219.

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