The correct answer is C. All of theses.
More than 30 million year ago massive extensions of swamp waters and marshlands were formed in Oklahoma. As the years went by these swamp waters were buried beneath soil, sand and gravel however, these water deposits later provided the state with natural resources such as coal, petroleum and natural gas. Thus they are or were called swamp treasures due to their multiple uses and the richness they gave to the state.
Propaganda, they inspired more people to join the fight on America's side.
In pre-WW2 Japanese culture, there existed a strict social hierarchy. One of the lowest things one could do in said hierarchy, is surrender. This was seen as dishonorable, and lowered one’s potion to lower than dogs. Any sign of disobedience and hesitation to the captor by the prisoner was seen as disrespectful, and accordingly.
