Answer:
B. Russia
Step-by-step explanation:
A and D are obviously wrong as they were the ones who disputed it.
Mexico claimed it through Spain, and I think they owned it too.
Russia on the other hand only owned Alaska, Fort Ross in California, and some outposts in Hawaii, So Russia couldn't reach or claim it. meaning C is the Answer
A. The U.S.
B. Russia
C. Mexico
D. The Native Americans that lived there E. Great Britain