In what way did the purchase of Alaska fit with Secretary of State William Seward’s foreign policy toward Asia?

ASeward thought the purchase of Alaska could protect the United States from Asian aggression.
BSeward thought that Alaska could be a stepping stone to increased trade with Asia.
CSeward thought the purchase of Alaska would weaken Japan and other Asian powers.
DSeward thought the purchase of Alaska would make it possible to annex Midway Island.

Verified Answer :

C. Seward thought the purchase of Alaska would weaken Japan and other Asian powers. 

Answer:

B. Seward thought that Alaska could be a stepping stone to increased trade with Asia.

Explanation:

On March 30, 1867, the United States achieved a consent to buy Alaska from Russia at a cost of $7.2 million.

The Treaty with Russia was arranged and marked by Secretary of State William Seward and Russian Minister to the United States Eduard de Stoeckl.