What was the political significance of Kublai Khan’s conquest of China?
Kublai Khan united with the Sung dynasty to unify China.
Kublai Khan defeated the Mongol ruler of China.
Kublai Khan defeated the Tang dynasty of China.
Kublai Khan unified China under the Yuan dynasty.

these conditions long with a short growing season made farming difficult.

explanation:

the north has a climate of warm summers and snowy cold winters. the terrain is rocky, hilly, and not good for farming.

the alfred thayer mahan award for literary achievement is awarded each year by the navy league of the united states. the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation. presented since 1957, "this award for literary achievement is awarded to a u.s. navy officer, u.s. marine corps officer, enlisted service member, or civilian who has made a notable literary contribution that has advanced the knowledge of the importance of sea power in the united states."[1]

the answer is going to be c