The correct answer is option 2: 2 only.
Option 1 states that the countries affected by displacement due to civil war/terrorist violence are Namibia and Syria.
Option 3 states that all three countries, Namibia, Syria, and Mozambique, have experienced a significant displacement of citizens due to civil war/terrorist violence.
Option 4 states that none of the countries mentioned have experienced displacement due to civil war/terrorist violence.
However, the correct answer is option 2 as only Syria has experienced a lot of displacement of its citizens due to civil war/terrorist violence.
Namibia and Mozambique have not experienced significant displacement due to civil war/terrorist violence.
Therefore, option 2 is the correct answer.