USA Purchased Alaska From Which Country?

Name the Country from which USA purchased Alaska ?

(A) China
(B) Russia
(C) Japan
(D) None of These .

Do you know that Alaska was Purchased by USA in 1867 from Russia . Alaska was the Part of Russia before March, 30, 1867 and US reached an Agreement at $7.2 Million ratified by United States Senate and signed by President Andrew Johnson  .