Darmium, a Powerful Country, Attacked Lesterberg to Free the Colonies

Darmium, a powerful country, attacked Lesterberg to free the colonies Lesterberg had acquired over the century. Darmium believed that countries should be allowed to be free and not be ruled by other countries. It interfered in Lesterberg's affairs as Lesterberg's actions were against its ideals. This act of the government of Darmium can be considered an instance of _____.

A) neutrality
B) isolationism
C) deterrence
D) interventionism
E) containment