After Germany surrendered to sign,the Allied Nations signed as well HOWEVER America turned against the Treaty of Versailles and this chose not to sign. A few other countries signed as well, but those were the main.
<span>Mixed market economies focus on preserving as much freedom to make economic choices as possible. Governments in these economies have limited involvement in managing and regulating the economy. In contrast, command economies are focused most on preserving and requiring equal opportunities, which means governments that greatly regulate the economy. More economic systems are geared toward offering producers and consumers the freedom to make economic choices, so mixed market economies are more common in the world today.</span>
The question for your answer is “A”
Barack Obama was known to run against Mitt Romey. Although, Hillary Clinton also did run against Barack Obama, it wasn't as known. Therefore, D would be the correct answer.
Hoped this helped!!
~Bob Ross™