Caspian Sea because it is the closest
Under Kublai Khan the Mongol empire reached its largest extension. He ruled over 24000000 km² (nearly 10000000 mi²). The empire went from China and Korea to Iran and southern Russia, from the Korean peninsula to the Danube River.
During Kublai's reign the empire was divided into four smaller Kanatos but he still remained as the Great Khan of all of them. He was actually the first Khan to successfully conquest China in 1279, making him the first Yuan ruler of the whole China. After his death, the mongols didn't elect a new Khan and the Kanatos became more independent.
Letter A is correct. Many are the reasons that led to the United States expansion, but the desire to extend Christianity was not one of them. The U.S expanded westward across North America, initially as part of 'Manifest Destiny', but also as an outlet for their growing population. They also wanted an overseas empire like the other major western powers at the time (such as Britain and France). And, that included new markets and sources of revenue along with a more proeminent position on the world stage.
The Second Amendment to the Constitution of United States states:
"...the right of the people to keep and bear arms shall not be infringed. "
From the given options, the option D is the most likely interpretation of the second amendment i.e. There should be no limits on owning and using guns. The point highlighted in rest of the options is not listed anywhere in the amendment.
Therefore, the correct option is D.
<span>There should be no limits on owning and using guns.</span>