"Silk Road trade routes" is the one route among the following choices given in the question that he would most likely follow to achieve his goal. The correct option among all the options that are given in the question is the third option or option "c". I hope that this is the answer that has come to your desired help.
A relatively flat land good for farming is called a plain
It's better to have air conditioning units near the ceiling regardless of where you live. Since cool air sinks, air conditioning units are usually near the ceiling so the cool air can spread around the room more. Hope this helped =)
