There Is a Devaluation of Country A's Money Relative to Country

There is a devaluation of Country A's money relative to Country B's money when the amount of gold backing one unit of Country A's money goes from:

A) 1/50 of an ounce to 1/40 of an ounce, and the amount of gold backing one unit of Country B's money remains unchanged.
B) 1/50 of an ounce to 1/60 of an ounce, and the amount of gold backing one unit of Country B's money remains unchanged.
C) 1/50 of an ounce to 1/25 of an ounce, and the amount of gold backing one unit of Country B's money goes from 1/30 of an ounce to 1/60 of an ounce.
D) none of the above.