Indentured servants is the correct answer.
These are usually people who wanted to go to the new world, but are too poor to finance themselves for the trip, and so they agree with a person on the amount of time they would work for their 'master' in exchange for a "free passage"
hope this helps
C. handling the process of sending international mail
The Atlantic Charter-the joint declaration of the president of the United States of Roosevelt and the Prime Minister of Great Britain Churchill of August 14, 1941, signed on board the English battleship Prince of Wales "in the Bay of Argentia (O. Newfoundland).
The declaration proclaimed in it the sovereignty, territorial inviolability, security and economic cooperation of the countries, striving to achieve for all people "a higher standard of living, economic development and social Security and disarmament of aggressive countries.
The best option from the list would be "battle" in terms of a category for "bombardment", since this refers to when an enemy launches weapons (usually bombs or missiles) into the territory of the enemy.