What do you need help with?
The answer is: A. accountant
The main duty of an accountant is to prepares the financial information of an individual or an organisation. In order to do this, you need a really good command of math skills since all the information regarding the assets , liability, and capital of the individuals/organization is recorded in a numerical value.
Its started after World War 2 because after a lot of issues arose between the US and USSR. They had a mutual distrust with each other stemming from the way the US had perceived the USSR as an illegitimate part of the international community. The way the USSR perceived the US as people who intervened in everyone's business and had amounted weapons.
I do have AP world history