If in 2012,the Canadian Dollar's Exchange Rate with the Sudanese

If in 2012,the Canadian dollar's exchange rate with the Sudanese dinar was .0069 dollars per dinar and in 2015,the exchange rate was .0062 dollars per dinar,it would indicate that in the period from 2012 to 2015,the dollar:

A) strengthened against the dinar.
B) weakened against the dinar.
C) was unrelated to the value of the dinar.
D) the answer cannot be determined without knowing the number of dinars needed to buy a dollar.