The correct answer is: an extreme political ideology.
Indeed, the movement’s ideology was a very dogmatic blend of several ideologies and outlooks. They were heavily Stalinist and Maoist in their leftism; extremely xenophobic against both foreigners and national non-Khmer minorities and extremely agrarian.
With regards to their Stalinist/Maoist outlook they believed in absolute obedience to the party and its leaders, with a set of inviolable strict rules and laws and the belief that the ends justified any means.
They loathed national minorities as they saw them as a stain on their national Khmer purity and they despised foreigners because they refused to ever be colonized again, whether by Westerners or Asians.
They also considered that urban, capitalistic society was a disease and sought to eradicate it by eradicating its people.
The Second World War was a political and military conflict on a global scale that took place between 1939 and 1945, in which most of the countries of the world were involved and which represents one of the most traumatic and significant historical and cultural milestones of the century. XX, given the state of Total War (absolute economic, social and military commitment of nations) assumed by the two sides involved.
The conflict cost the lives of between 50 and 70 million people, both civilian and military, of which 26 million belonged to the USSR (and only 9 million were military). Particular case are the millions of people executed in concentration and extermination camps, subjected to subhuman conditions of existence or even to medical and chemical experiments, such as the almost 6 million Jews systematically exterminated by the German National Socialist regime. The latter was called the Holocaust.
To this must be added the numerous deaths that the economic consequences of the conflict caused worldwide, such as the famine in Bengal that claimed the lives of almost 4 million Indians, and which are often ignored by the official history of the conflict, whose total balance of deaths may be around 100 million people.
The nationalists and communists became allies again, because they had a common enemy, Japan, as Japan was invading China at the time. The two sides called for a ceasefire and worked together to stave off the onrushing Japanese invasion.
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C. unemployment it might be right
To sell the war to the nation, the government raised taxes. It raised ⅓ of the war effort from raising taxes with progressive income, war profit tax, tobacco, liquor, and luxurious goods. They also had thousands of people asking for money and guilted them if they didn't give them any by saying only "a friend of Germany" wouldn't help.
