Option 1: Three - This option implies that three Indian states border Myanmar. However, this is incorrect.

Option 2: Four - This is the correct answer. Four Indian states border Myanmar. The states are Arunachal Pradesh, Nagaland, Manipur, and Mizoram. These states share a border with Myanmar and facilitate trade, cultural exchanges, and people-to-people interactions between the two countries.

Option 3: Five - This option suggests that five Indian states border Myanmar. However, there are only four Indian states that share a border with Myanmar.

Option 4: Six - This option implies that six Indian states border Myanmar. However, this is incorrect.

In conclusion, the correct answer is option 2: Four Indian states border Myanmar.